VersaPoint RS-232 Communications Module IC220BEM232, GFK
Contents
1. Object START IND Access Read write Data Type Simple variable 1 byte Index 5FC hex Subindex O0hex Length byte 01 hex Data Module start indicator 00 Reset powerup message 01 powerup completed VersaPoint Module RS 232 Communications IC220BEM232 GFK 2394 August 2005 V24 DATA Object This object is used for sending and receiving RS 232 data V24 DATA Object Description Object V24 DATA Access Read write Data Type String Var of Octet String 1 x 58 bytes Index 5FEQnex Subindex O0hex only access to all data possible Length byte OOhex Amount of data present in the buffer 3Anex Maximum length of the object Data Send receive RS 232 data If no V 24 data is available on a read access a read response read service reply is generated with result and length 0 With a protocol data unit PDU size of 64 bytes a maximum of 58 characters can be transmitted The length of the read or write service depends on the number of the RS 232 characters to be transmitted If for example 20 RS 232 characters are to be read the read response will be 24 bytes long 20 bytes of RS 232 data 4 bytes PCP overhead Error Messages for the V24 DATA Object If during a write service there is not enough transmit memory available for RS 232 data the service is answered with a negative confirmation The parameters are Error_Class 8 Error_Code 0 Additional_Code 0022he2. VersaPoint Module RS 232 Communications Module IC220BEM232 GFK 2394 The VersaPoint RS 232 Communications Module IC220BEM232 interfaces serial I O devices to a VersaPoint I O Station Module with Attached Terminal Strips Module IC220BEM232 requires a standard and shielded Terminal Strip See the ordering information below Features Serial I O channel RS 232 Supports DTR CTS handshake Supports various protocols Baud rate adjustable up to 38400 baud Adjustable number of data bits stop bits and parity Configuration and data exchange using PCP communications services 4 kbyte receive buffer 1 kbyte transmit buffer LED diagnostic and status indicators March 2010 Module Specifications Housing dimensions width x height x depth 24 4mm x 120mm x 71 5mm 0 96in x 4 8in x 2 86in Operating temperature 25 C to 55 C 13 F to 131 F Storage temperature 25 C to 85 C 13 F to 185 F Operating humidity 75 average 85 occasionally Take appropriate measures against increased humidity Storage humidity 75 average 85 occasionally Degree of protection IP 20 according to IEC 60529 Communications power UL Power Consumption 7 5V Current consumption from local bus UL 155mA maximum 225mA maximum Nominal current consumption at Us None Total power consumption 0 163W typical 1 688W
3. 3 Data width 02 8 data bits even parity Unsigned 8 1 stop bit 4 4 Reserved 00 Unsigned 8 5 5 Reserved 00 Unsigned 8 6 6 Error pattern 24 Unsigned 8 7 7 First delimiter 0D Carriage return CR Unsigned 8 8 8 Second delimiter 0A Line Feed LF Unsigned 8 9 9 3964R priority 00 Low Unsigned 8 10 A Output type 00 RS 232 Unsigned 8 11 B DTR control 00 Automatic Unsigned 8 system 12 C Rotation switch 00 No rotation Unsigned 8 13 D XON pattern 11 Unsigned 8 14 E XOFF pattern 13 Unsigned 8 15 20 F 14 Reserved 00 Unsigned 8 10 VersaPoint Module RS 232 Communications IC220BEM232 GFK 2394 August 2005 INIT TABLE Element Values Element VELTE iT 4 Protocol Protocol 00 Transparent 01 End to end 02 Dual buffer 03 3964R 04 XON XOFF Baud rate 00 110 04 1800 08 19200 01 300 05 2400 09 38400 02 600 06 4800 0A 03 1200 07 9600 0B Element Value Data Width Value Data Width hex hex Data 00 7 data bits even parity 1 stop bit 06 7 data bits even parity 2 stop bits Width 01 7 data bits odd parity 1 stop bit 07 7 data bits odd parity 2 stop bits 02 8 data bits even parity 1 stop bit 08 8 data bits even parity 2 stop bits 03 8 data bits odd parity 1 stop bit 09 8 data bits odd parity 2 stop bits 04 8 data bits without parity 1 stop bit OA 8 data bits without parity 2 stop bits 05 7 data bits without pa
4. maximum Ordering Information IC220BEM232 IC220TBK203 Communications Module RS 232 Terminal Strip Set VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 Terminal Assignments Terminal Strip 1 left Terminal Point Assignments 1 4 2 4 FE Functional earth ground All other terminal points on this Terminal Strip not used Terminal Strip 2 right Terminal Point Assignments 1 1 RxD Serial data input 2 1 TxD Serial data output 1 2 5V Control output internally connected to 5VDC 2 2 CTS Control input for hardware handshake 1 3 DTR Control output for hardware handshake 2 3 GND GND for serial interface 1 4 2 4 Shield Shield Connection Example Connections By using points 1 4 and 2 4 on both Terminal Strips the cable shield can be connected either using a capacitor Terminal Strip 2 or directly to functional earth ground Terminal Strip 1 Connecting one side of the cable shield directly and one side using a capacitor to FE can prevent the creation of ground loops that would occur if a shield with two direct connections were placed on FE When connecting to the shield via Terminal Strip 1 the shield connector must be connected to the left side of the Terminal Strip All wires must be connected to Terminal Strip 2 On Terminal Strip 2 point 1 2 5V must only be used to provide the 5 volt signal for the CTS input
5. memory VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 RS 232 Wiring with Handshake for DTE The TxD RxD DTR and CTS signals are used for a four wire handshake connection between the RS 232 Communications Module and the device to be connected Each signal corresponds to one wire in the connecting cable A Terminal Strip is required on the VersaPoint RS 232 Communications module A 9 or 25 position female connector is required on the opposite side depending on the device to be connected Both GND pins are wired In the diagrams below the shield connector is connected on the right side of the terminal In this case the shield is connected with a capacitor to FE If the shield is to be directly connected to FE the shield connector must be connected on the left side of the terminal Typical Wiring for 25 Pin Typical Wiring for 9 Pin Connector Connector IC220BEM232 DTE Device IC220BEM232 DTE Device 3 TxD 2 RxD T6 7 RTS 8 CTS 4 ptr LOU 5 GND RS 232 Wiring with No Handshake for DTE In the case of wiring without handshake the wires for the TxD and RxD signals and the GND contacts are connected to the RS 232 Communications Module Terminal Strip and soldered to the female connector on the side of the device to be connected In addition a jumper is connected on the Terminal Strip between the po
6. 23 bytes 1 kbyte of data for transmission and store up to 4096 bytes 4 kbytes of data received from the connected device If the module receives another character after the 4095th the error pattern is stored in the receive FIFO All other subsequent characters are ignored XON XOFF Protocol XON XOFF Protocol works in the same way as Transparent Protocol but uses software handshake instead of hardware handshake Data transmission is controlled by the XON and XOFF characters XON is preset to 11hex and XOFF to 13hex These characters can also be defined when the module is configured using the INIT TABLE object as described in the NIU User s Manual If the module receives an XOFF character it stops transmitting data When the module receives an XON character it starts transmitting data again The RS 232 Communications module sends an XOFF when the available space in the Received Data FIFO is less than 5 bytes As soon as more memory becomes available the module sends a single XON Transmission is not dependent on the CTS input The module does not filter serial data before transmission Any characters that occur with the code defined for XON and XOFF are sent and may trigger undesirable events at the receiver When the module receives serial data the XON and XOFF characters are filtered and are not made available as data Any characters with the XON or XOFF code are lost It is your responsibility as the user to ensure that characters wit
7. Communications IC220BEM232 GFK 2394 August 2005 Programming Data The VersaPoint RS 232 Communications Module uses Process Data outputs and Process Data Inputs to monitor and reset the status of the RS 232 communications The module uses PCP Communications described next to configure the communications parameters and to exchange the RS 232 data with the I O Station s NIU ID code DC hex 220dec Length code 01 hex Process data channel 16 bits Input length 2 bytes Output length 2 bytes Parameter channel data PCP 4 bytes Register length 6 bytes Process Data Output Control Word The controller sends the RS 232 Communications Module one word of output data The basic format of this data is Process Data Word Reserved DTR Reserved Re initialize Reset Transmit Error Reset Receive Error Reserved The DTR signal can only be generated when DTR control via process data is enabled If the control word contains the value 3COQhex the Process Data Input Word see next page returns the firmware version VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 Process Data Input Status Word The RS 232 Communications Module sends the controller one word of input data The basic format of this data is Process Data Word MSB LSB 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1740 Reserved a Transmit Buffer not E
8. Point Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 Data Lengths and Protocols The VersaPoint RS 232 Communications Module stores the data it exchanges with the connected serial device in a Transmit buffer area and a Receive buffer area The amount of data these buffers will store depends on the type of protocol being used by the connected device Protocol Transmitted Data Received Data When Receiving Data Transparent 1023 bytes 4096 bytes XON XOFF 1023 bytes 4096 bytes Software handshake End to end 1023 bytes including end 25 buffers each with 58 Two end characters are filtered out characters bytes Dual buffer 1023 bytes including end 2 buffers each with 58 bytes Only stores the most recently received characters data End characters are filtered out 3964R 15 buffers each with 58 2 buffers each with 58 bytes Data exchange with software handshake bytes time monitoring and checksum Protocol Characteristics The VersaPoint RS 232 Communications Module must be configured to match the type of protocol supported by the connected device The default protocol is XON XOFF Transparent Protocol With Transparent Protocol data is transmitted in the same format it was received Transparent Protocol supports a CTS hardware handshake The module stores data to be transmitted and data received from the attached device in FIFO First In First Out memory The module can store up to 10
9. ation 00 No rotation Switch 01 Rotation The rotation switch determines how the buffer is re written when the buffer is full and the two end characters delimiters have not been detected No rotation In the re written buffer only the new data is available i e data from the previous cycle is rejected Rotation The buffer is re written character by character If the two delimiters are detected the new characters and the remaining characters from the previous cycle are available in the re written buffer XON pattern and XOFF pattern contain the control characters for the XON XOFF protocol The characters must not be the same 12 Element VELTE 1 9 XON Pattern XON 11 Pattern xx Any Character must be different than XOFF pattern Element VELTE 19 XOFF Pattern XOFF 13 Pattern xx Any Character must be different than XON pattern VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 INIT TABLE Object Error Messages If an element with an invalid value is written during a write service the service is answered with a negative confirmation The parameters are Error_Class 8 Error_Code 0 Additional_Code xx30hex Meaning Value is out of range The high byte of the ADDITIONAL_CODE xx contains the number of the affected element If several elements are affected the highest number is given If for example the DTR control element is wri
10. e uses PCP communications for configuration and data transfer The module s PCP communications characteristics are described here Details of using PCP communications are provided in the NIU User s Manual for the type of Network Interface Unit being used in the I O Station Object Dictionary of the RS 232 Communications Module Index Data Type Number of Length Meaning Object Name Access hex Elements bytes Permitted 5FC1 Variable of 1 1 Module start indicator START IND read write Unsigned 8 5FEO String Variable 1 58 Transmit V24 DATA read write of Octet String receive RS 232 data 5FFF Array of 20 1 Module configuration INIT TABLE read write Unsigned 8 START IND Object The START IND object indicates whether or not the module was restarted After the voltage has been switched on power up the byte always has a value of 01hex For a restart to be detected the application must have previously set the byte to OOhex If it is then reset by the terminal to O1hex a restart is triggered The START IND object has no meaning as far as the module functions are concerned If the application sets the Module Start Indicator to 01 Powerup Completed it has no effect on the module Setting this data does not trigger a restart In addition if the application sets the Module Start Indicator to 01 it is then not possible for the application to detect a module restart START IND Object Description
11. ffer is re written character by character If the two delimiters are detected the new characters and the remaining characters from the previous cycle are available in the re written buffer rotation When the VersaPoint I O Station NIU provides serial data to the RS 232 Module for transmission to the attached device the NIU attaches two additional characters the first and second delimiters The first and second delimiters are defined when the module is configured using the INIT TABLE object 3964R Protocol This protocol uses beginning and end identifiers a checksum and a time monitoring function There are 15 buffers available for transmitting and 25 buffers for receiving Character delay time 220 ms Acknowledgment delay 2 seconds Block waiting time 10 seconds Number of attempts to establish a connection 6 The optional 3964 priority defines which device may transmit first high priority if there is an initialization conflict more than one device attempting to transmit data simultaneously 15 VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 Specifications for Communications Module IC220BEM232 Type RS 232 interface with DTR CTS handshake Data terminal equipment DTE version Electrical data according to EIA RS 232 CCITT V 28 DIN 66259 Part 1 Input Impedance 5k Ohms typical Permissible input voltage range 30V to 30V Switching thresholds 0 8V to 2 4V H
12. h these codes do not appear in the data stream 14 VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 End to End Protocol When the VersaPoint I O Station NIU provides serial data to the RS 232 Module for transmission to the attached device the NIU attaches two additional characters the first and second delimiters The first and second delimiters are defined when the module is configured using the INIT TABLE object as described in previously The VersaPoint I O Station NIU can only read serial data from the RS 232 Communications Module if the module has received the first and second delimiters The two end characters confirm that the data has been received without error and the maximum data length of 58 bytes has been observed The delimiters are filtered out when the NIU reads the data For End to End Protocol the area of internal memory used for received data is organized as a series of 25 buffers it is not organized as a FIFO Each buffer contains 58 bytes If the buffer size of 58 bytes is exceeded without the two delimiters being detected the buffer is overwritten again Depending on the INIT TABLE object subindex OChex Rotation Switch data can be overwritten in two different ways If the Rotation Switch parameter OChex is set to 0 the defaut only new data in the re written buffer is available data from the previous cycle is rejected If the Rotation Switch parameter OChex is set to 1 t
13. he buffer is re written character by character If the two delimiters are detected the new characters and the remaining characters from the previous cycle are available in the re written buffer rotation The send FIFO can store 1023 bytes The delimiters are attached to and stored with the data to be sent Dual Buffer Protocol With Dual Buffer Protocol the RS 232 Module stores the last data block it receives The data block is a string of characters with the first and second delimiter end characters as in the End to End Protocol When the module receives a new data block the previous one is overwritten This is done by using two buffers which are written alternately One buffer is always available to receive new serial data while the other buffer stores the last received data block A data block is only regarded as complete once both delimiters have been detected one after the other When the data block is complete it can be read by the VersaPoint I O Station NIU If the buffer size of 58 bytes is exceeded without the two end characters delimiters being detected the buffer is overwritten again Depending on the INIT TABLE object subindex OChex Rotation Switch data can be overwritten in two different ways If the Rotation Switch parameter OChex is set to 0 the defaut only new data in the re written buffer is available data from the previous cycle is rejected If the Rotation Switch parameter OChex is set to 1 the bu
14. ints for 5V and CTS signals and on the female connector between the pins for the RTS and CTS signals That simulates the ready to receive state for the peer and the connected device will always be able to send via the RS 232 interface The terminal sets the DTR signal to Low before the receive FIFO memory overflows As the DTR signal is not evaluated using wiring without handshake some of the data sent to the module via the V 24 interface may be lost until the module is ready to receive again Typical Wiring for 25 Pin Typical Wiring for 9 Pin Connector Connector IC220BEM232 DTE Device IC220BEM232 DTE Device GFK 2394 VersaPoint Module RS 232 Communications 1C220BEM232 August 2005 Internal Circuit Diagram of the RS 232 Communications Module 24 V Ug mm 24 V Up t RS 232 Interface RS 232 Interface Interface OIOI OON E HASA A RS 232 Module LEDS TR RS 232 LEDs Optocoupler DC DC converter with electrical isolation Microprocessor RS 232 interface Capacitor Ground electrically isolated from ground of the potential jumper LED Color Meaning Green Bus diagnostics TR Green I O Station communications active RxD Yellow Receiving data from connected device TxD Yellow Transmitting data to connected device VersaPoint Module RS 232
15. mpty Transmit Buffer Full Receive Buffer Full Re initialization both buffers are empty Transmit Error with 3964R telegram Receive Buffer with 3964R telegram Receive Buffer not Empty Status Bit Definitions Bit Meaning Protocol 0 1 The Receive Buffer is not empty characters to be read are available All 1 1 The receive error indicates that a 3964R telegram could not be received without error 3964R after six attempts by the connected device or after the block waiting time had elapsed 2 1 The transmit error indicates that a 3964R telegram could not be transmitted by the RS 232 Communications Module to the connected device without error after six sent attempts The telegram was rejected 3 1 Reinitialization was executed Transmit and Receive Buffers are now empty All 4 1 The Receive Buffer is full Transparent end Transparent and XON XOFF protocol residual capacity is lt 15 characters to end 3964R 3964 and end to end protocol residual capacity is lt 30 characters XON XOFF 5 1 The Transmit Buffer is full All 3964R protocol residual capacity is none Dual buffer transparent end to end XON XOFF protocol residual capacity is lt 30 characters 6 1 The Transmit Buffer is not empty characters to be sent are available All 7 Reserved VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 PCP Communications The VersaPoint RS 232 Communications Modul
16. point 2 2 for communications without handshaking A jumper must be inserted between the points 1 2 and 2 2 No other use is permitted Example Wiring for 4 Wire Handshake Example Wiring for No Handshake Points 1 2 5V and 2 2 CTS are jumpered oO Op og Oo S C VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 August 2005 RS 232 Interface The RS 232 interface on the RS 232 Communications Module provides a DTE data terminal equipment connection Terminal Strip 2 point 2 1 TxD is always used to transmit and point 1 1 RxD is always used to receive Some type of DCE data communications equipment is connected to the RS 232 interface as a peer A DTE can also be connected Measuring the voltage between the connection points for the TxD and GND signals in the idle state will determine whether the device to be connected is a DTE or DCE device If the voltage measures approximately 5V it is a DTE device If the voltage is approximately OV it is a DCE device The diagrams that follow show cabling between the RS 232 Communications Module and a typical DTE device with a D Sub 9 pin or 25 pin female connector Actual pin assignments of an attached device may be different than those shown depending on the type of device used Both GND pins are wired In the examples the shield is connected with a capacitor to FE and the Terminal Strip with the shield i
17. rity 1 stop bit 0B 7 data bits without parity 2 stop bits Element VELTE 1 9 Error Pattern Error 24 Pattern xx Any character The error pattern character is written to the FIFO memory if an error occurs while receiving an RS 232 character this does not apply to the 3964R protocol This can be the result of for example parity errors exceeded value ranges or noise interferences In the transparent and XON XOFF protocols the pattern is also used if the receive FIFO memory is full and further characters are received Element VELTE 1 9 First Delimiter First OD Carriage Return CR Delimiter xx Any character The first delimiter and the second delimiter contain the end characters for the dual buffer and the end to end protocol Element VELTE 17 4 Second Delimiter Second 0A Lie Feed LF Delimiter xx Any character 11 VersaPoint Module RS 232 Communications IC220BEM232 GFK 2394 Element VEUEN 1 9 3964R Priority 3964R 00 Low priority Priority 01 High Priority 3964R priority defines the priority of a device if more than one device attempts to send data simultaneously at initialization The device with priority 1 has priority over the device with priority O Element VELON 1 9 Output Type Output oD RS 232 Type Element VELTE 1 9 DTR Control DTR 00 Automatic Control 01 Via process data Element VELTE 119 Rotation Switch Rot
18. s installed on the right side of the RS 232 Communications Module If the shield is to be directly connected to FE the Terminal Strip with the shield must be installed on the left side of the module Handshake Signals Any device with an RS 232 interface can be connected to the VersaPoint RS 232 Communications Module Both the module itself and the connected device can act as transmitted and receiver for exchanging data Because errors can occur when both devices are sending and receiving simultaneously the handshake is used to mutually signal clear to receive and clear to send The VersaPoint RS 232 Communications Module supports DTR and CTS handshake signals Each uses one wire of the connecting cable The handshake signals are described below Signal Direction Meaning CTS Input The RS 232 Communications Module receives the CTS signal from the connected device If CTS is set to High the module can send data Exception 3964R XON XOFF protocol DTR Output The RS 232 Communications Module sends the DTR signal set to high when it is ready to receive After the connected device sends 4095 characters 4 kbytes the module s Transmit Receive Buffer is full and it sets the DTR signal to low After more characters are read from by the NIU the DTR signal is again set to High and the module is ready to receive With the transparent XON XOFF and end to end protocols DTR is set to 0 if fewer than 15 characters are free in the Receive FIFO
19. tten with the value 2 an error message with the ADDITIONAL_CODE OB30hex is generated because the 11th element is faulty An error message is generated for a write request with the subindex 0 write entire table in which the XON XOFF protocol is to be set and the XON and XOFF patterns are the same The parameters are Error_Class 8 Error_Code 0 Additional_Code 0E30nex Meaning Parameterization error If a reserved element is to be written the value must be equal to 0 otherwise an error message is generated The parameters are Error_Class 8 Error_Code 0 Additional_Code xx3Q0hex Meaning Parameterization error PCP Mode Error Messages The RS 232 Communications module s error messages have the following parameters Error_Class 8 device specific error Error_Code 0 no communication error The exact error cause is given by the Additional_Code The ADDITIONAL_CODE low byte indicates the error cause The high byte of the ADDITIONAL_CODE xx contains the number of the affected element If several elements are affected the highest number is given The following ADDITIONAL_CODEs may occur with the RS 232 Communications module 0022hex No character from the RS 232 data will be accepted from this service XX30hex Value is out of range or parameterization error 0000hex Hardware fault For additional information on error messages in PCP mode please refer to the N U User s Manual for the NIU in the I O Station 13 Versa
20. x Meaning No character from the RS 232 data will be accepted from this service A write service without user data length 0 is answered with a negative confirmation The parameters are Error_Class 8 Error_Code 0 Additional_Code 0030hex Meaning Value is out of range VersaPoint Module RS 232 Communications 1C220BEM232 GFK 2394 INIT TABLE Object The module is configured in PCP mode with a write service using the INIT TABLE object August 2005 If at least one element of the INIT TABLE object is written the pointers for the send and receive FIFO memory are reset This means that all send and receive data that has not yet been processed is lost INIT TABLE Object Description Object INIT TABLE Access Read write Data Type Array of Unsigned 8 Index 5FFFhex Subindex OOhex Write all elements O9hex 3964R Priority O1 hex Protocol OAhex Output type O2hex Baud rate OBhex DTR control system O3hex data width OChex Rotation switch O4hex O5hex Reserved ODhex XON Pattern O6 hex Error Pattern OEnex XOFF Pattern OT hex First Delimiter OF hex to 14hex Reserved O8hex Second Delimiter Length 14hex Subindex O0hex bytes O1hex Subindex 01hex to 14hex Data VersaPoint RS 232 module configuration INIT TABLE Object Elements Default Setting Meaning Meaning 1 1 Protocol 00 Transparent Unsigned 8 2 2 Baud rate 07 9600 baud Unsigned 8
21. ysteresis 0 5V typical Output voltage with 3 Ohm load High 6 7V typical Low 6 7V typical Output voltage no load operation High lt 25V Low gt 25V Permissible load capacity 2500 pF Short circuit protected against GND Yes Short circuit current 60mA maximum Power Dissipation Power dissipation of the electronics 1 163W Power dissipation of the housing 1 2W maximum Electrical Isolation Isolation of the Voltage Range The electrical isolation of the logic level from the serial interface is ensured by the DC DC converter Common Potentials The serial interface control and data lines are electrically isolated on the same voltage FE is a separate potential area Separate System Potentials Consisting of Module Power Terminal and I O Terminal 5V supply incoming remote bus 7 5V supply bus logic 500 VAC 50 Hz 1 min 5V supply outgoing remote bus 7 5V supply bus logic 500 VAC 50 Hz 1 min RS 232 interface 7 5V supply bus logic 500 VAC 50 Hz 1 min RS 232 interface 7 5V supply bus logic 500 VAC 50 Hz 1 min 7 5V supply bus logic 24V supply I O 500 VAC 50 Hz 1 min 7 5V supply bus logic functional earth ground 500 VAC 50 Hz 1 min 24V supply I O functional earth ground 500 VAC 50 Hz 1 min 16
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