ADR112 USER MANUAL - Ontrak Control Systems
Contents
1. BR Oc Oo DIGITAL 1 0 10 OPEN COM1 9600 N 8 1 CS DS RS AS 1 20 CLS 30 LOCATE 1 1 40 PRINT 1 CPA11111111 50 REM 60 PRINT 1 RPAO 70 INPUT 1 SW1 80 PRINT 1 RPA1 90 INPUT 1 SW2 100 T1 CLOSED IF SW1 1 THEN T1 OPEN define T1 110 T2 CLOSED IF SW2 1 THEN T2 OPEN define T2 sprint SW1 status sprint SW2 status repeat procedure 120 PRINT SW1 is T1 130 PRINT SW2 is T2 140 GOTO 60 C Connecting LED s to Digital Ports opens com port clears screen locates cursor configures port as input forces CR PAO SW1 saves status in variable SW1 PA1 SW2 saves status in variable SW2 LED s may be controlled using the digital I O lines on the ADR112 Only one additional component is needed to drive LED s A current limit resistor is required for each LED with a value of around 220 Ohms Digital I O lines can source LED1 or sink LED2 LED current LED1 is turned on by setting PAO to a logic one or turned off by resetting PAO to a logic zero The sample BASIC program demonstrates how to turn the LED on and off ADR1 12 Boe DIGITAL 1 0 220 OHM ONTRAK CONTROL SYSTEMS INC 14 19 www ontrak net 10 OPEN COM1 9600 N 8 1 CS DS RS AS 1 opens com port 20 CLS clears screen 30 PRINT 1 RESPAO resets PAO 40 REM f2. RESPAO turns relay on 80 REM Turn off relay forces cr 90 PRINT 1 SETPAO turns relay of ONTRAK CONTROL SYSTEMS INC 15 19 www ontrak net E Temperature Measurement The LM335 solid state temperature sensor produces an output of 10mV per degree K Kelvin can be converted to Celsius by subtracting 273 or 2 73 volts from the reading The 12 bit analog inputs on the ADR112 return a value of 0000 to 4095 representing 0 to 5VDC 2 73V corresponds to a reading of 2235 9 To convert the reading to Celsius the following formula is used C reading 2235 9 8 19 The following BASIC program reads the temperature and displays its value on the host computer screen ADR1 12 D ET LI I 090909060606 or ann 2m 5 90A 6 e DIGITAL 1 0 ANA IN 1K OHM LM335 10 OPEN COM1 9600 N 8 1 CS DS RS AS 1 20 CLS 30 PRINT 1 RDO 40 INPUT 1 READING 50 TEM READING 2235 9 8 19 60 LOCATE 1 1 70 PRINT Temperature is TEM 80 GOTO 30 F 4 20mA Current Input Options LM335 Pin out 0 92 Package LM335Z 2 ll 123 FRONT opens com port clears screen sends RDO command retrieves data calculates temperature locates cursor displays temperature loop The ADR112 interface will accept 4 20 mA current inputs if proper current loop resistors are instal
3. 9Vd DIGITAL 1 0 90909090906 0 gt c ANA IN POWER Bm pry e GAS ONTRAK CONTROL SYSTEMS INC 17 19 www ontrak net APPENDIX B ELECTRICAL SPECIFICATIONS ADR112 Supply Voltage 5VDC 10 or 7 9VDC via wall adaptor Supply Current 15mA Typical 30mA Maximum Operating Temperature 0 50C All digital outputs unloaded Supply current maximum increases depending on current drawn from power supply terminals and current sourced by digital I O Analog Inputs 8 Resolution 12 bits Accuracy 0 2 Range 0 5VDC Input Impedance 1Mohm Digital I O 8 Sink Current 20mA Max Source Current 20mA Max Vout High 4 00V Min Vout Low 0 8V Max Vin High 2 2V min Vin Low 0 8V max Note Maximum total source or sink current from all I O lines in PortA 100mA Communication Interface RS232 9600 baud 8 bit words no parity 1 start bit Visit our web site at http www ontrak net for additional applications and programming examples ONTRAK CONTROL SYSTEMS INC 18 19 www ontrak net APPENDIX C MOUNTING DIMENSIONS ADR Interface Mounting Dimensions in inches lt 3 0 A o ADR101 ADR112 ADR2000A ADR2000B ADR2100 ADR2010 x f 26 Ext Dim 3 0 2 8 28 24 Hole Pat 2 6X2 4 Hole Dia 0 125 y 2 X FRONT B 5 4 ii et 5 0 28 24 ADR2200 Ext Dim 5 4 X 2 8 Hole Pat 5 0 2 4 o
4. ANA POWER v REGULATED DC OUT 5VOLTS 100mA ONTRAK CONTROL SYSTEMS INC 5 19 www ontrak net ANALOG INPUT COMMAND SUMMARY RDn Returns status of analog input in decimal format 0 5VDC Ref n 0 or 1 DIGITAL COMMAND SUMMARY CPAxxxxxxxx Configures PORT A x 1 for input x 0 for output SPAxxxxxxxx Output binary data to PORT A x21 RPA Returns status of all I O lines in PORT A in binary format RPAn Returns status of I O line specified by n n 0 to 7 MAddd Outputs decimal data ddd to PORT A ddd 0 to 255 PA Returns status of PORT A in decimal format RESPAn Resets I O line specified by PORT A n2 0to7 SETPAn Sets I O line specified by n in PORT A n 0 to 7 ONTRAK CONTROL SYSTEMS INC 6 19 www ontrak net 3 ADR112 COMMANDS a ANALOG INPUT COMMANDS There are 2 analog inputs with a resolution of 12 bits on the ADR112 labeled ANO to AN1 The analog input range is 0 to 5 VDC The command used to read analog inputs allow data to be retrieved in decimal format The command returns four integer characters ranging from 0000 to 4095 depending on voltage on port input RDn Returns status of analog port specified by n in decimal 0000 to 4095 format n 0 or 1 Input voltage range used for conversion is 0 to 5VDC example RD1 CR 2156 To convert to voltage voltage reading 4095 X 5 Input AN1 is 2156 4095 X 5 2 632V c DIGITAL PORT COMMANDS The
5. DATA FROM THE ADR112 If a command sent to the ADR112 is a responsive command that is one that results in data being sent back to the host the data is retrieved using the fscanf command After this command is used the serial buffer must be re initialized using the rewind command The syntax for this command is rewind stdaux This command is executed after data is retrieved using the fscanf command For example the following commands send an RDO command and stores the retrieved data in an integer variable named ANO fprintf stdaux RDO XD fscanf stdaux D amp an0 rewind stdaux In this example the command PA read port A Jis sent to the ADR112 and the retrieved data is stored in an integer variable named PORTA fprintf stdaux PA xD fscanf stdaux 96D amp PORTA rewind stdaux The following test programs outline the proper syntax for using the commands in simple applications The first program retrieves the status of analog port 0 and displays the data on the video screen The second program configures PORT A as output sets the port to decimal 255 reads back the port status and displays the data on the video screen ONTRAK CONTROL SYSTEMS INC 11 19 www ontrak net PROGRAM EXAMPLE ONE ANALOG PORT TEST PROGRAM include lt stdio h gt include lt bios h gt define com1 0 define settings 0 main declare 0 as an integer number int ano configure co
6. Hole Dia 0 125 v FRONT 7 8 I E 3 7 A t ONT ADRTERM Ext Dim 7 8X1 5 Hole Pat 7 4 X 1 1 Hole Dia 0 125 ONTRAK CONTROL SYSTEMS INC 19 19 www ontrak net
7. ADR112 ANALOG DIGITAL RS232 INTERFACE USER MANUAL V 3 0 Caution The ADR112 is a static sensitive device Observe proper procedures for handling static sensitive devices ONTRAK CONTROL SYSTEMS INC 764 Notre Dame Avenue Unit 1 Sudbury Ontario CANADA P3A 2T2 705 671 2652 VOICE 705 671 6127 FAX www ontrak net WEB Ontrak Control Systems Inc reserves the right to change product specifications to improve the product Although every attempt has been made to insure accuracy of information contained in this manual Ontrak Control Systems Inc assumes no liability for inadvertent errors Warranty This ADR112 is warranted from defects in workmanship and materials for a period of 90 days Liability for defects is limited to the purchase price of the product This warranty shall not apply to defects resulting from improper modifications or use outside published specifications Hyperterminal and Windows are trademarks of Microsoft Corporation APPLE MACINTOSH and MAC are trademarks of Apple Computer Inc PC XT AT PS 2 are trademarks of International Business Machines Inc COPYRIGHT 1999 ONTRAK CONTROL SYSTEMS INC TABLE OF CONTENTS READ ME FIRST 3 1 Communication options a The ADR112 RS232 Interface 4 2 Powering the ADR112 5 3 ADR112 Commands 7 a Analog Input Commands 7 b Digital Port Commands 7 4 Using BASIC with ADR Products 9 5 Using TURBO C with ADR Products 10 7 Interfacing to the AD
8. OMMANDS Sending commands in BASIC to the ADR112 can be done using PRINT 1 commands For example sending an RDO command could be done as shown below 20 PRINT 1 RDO Extra spaces inside the quotes are ignored by the ADR112 Avoid sending commands on consecutive lines because a CR is not sent after the first command resulting in an unrecognized command This problem arises with the configuring of a digital port and then trying to access the port immediately after it is configured A REM statement should be inserted between consecutive PRINTZ1 commands as shown below 20 PRINT 1 CPA00000000 30 REM FORCES CR 40 PRINT 1 SETPAO Variable names may also be used with PRINT 1 commands One example of this is shown below This program configures PORT A as output and then increments it from O to 255 10 OPEN COM1 9600 n 8 1 CS DS RS AS 1 20 PRINT 1 CPA00000000 30 FOR X 0 to 255 40 PRINT 1 MA X 50 NEXT X 60 END RECEIVING DATA When reading analog inputs or the digital port data is sent from the ADR112 to the host computers serial buffer This data can be retrieved using INPUT 1 commands The INPUT 1 command should be used following PRINT 1 commands if data is expected to be sent by the ADR112 If a single piece of data is expected then one variable name should be used with the INPUT 1 command If eight pieces of data are to be received as with the RPA command then eight variable names must be used with the INPU
9. R112 basic examples a Reading Potentiometer Position 13 b Connecting Switches to Digital Ports 13 Connecting LED S to Digital Ports 14 d Driving Solid State Relays 15 e Temperature Measurement 16 f 4 20 mA Current Loop Options 16 APPENDIX A CONNECTION DIAGRAM 17 B ELECTRICAL SPECIFICATIONS 18 C MOUNTING DIMENSIONS 19 ONTRAK CONTROL SYSTEMS INC 2 19 www ontrak net READ ME FIRST Thank you for purchasing this ADR112 serial data acquisition and control interface There are three steps to using the ADR112 1 Connecting a computer or terminal to the ADR1 12 2 Providing power to the ADR112 3 Sending commands to the ADR1 12 This manual will provide guidance for completing these steps along with BASIC and TURBO C programming tips An applications section is also provided to describe how to interface various electronic transducers and other devices to the ADR112 Additional applications and programming examples are available on our web page at http www ontrak net FEATURES 2 12 bit analog inputs 0 5 VDC 8 digital I O lines individually programmable as input or output High current digital I O lines sink 20mA source 20mA Three wire RS232 interface Low power requirements 5 volts at 15mA Power up via standard wall adapter optional Simple yet versatile commands Easy to use with Visual BASIC or TURBO C programs Compatible with all ADR series interfaces ONTRAK CONTROL SYSTEMS INC 3 19 www on
10. TZ1 command Examples of both cases are shown below ONTRAK CONTROL SYSTEMS INC 9 19 www ontrak net 20 PRINT 1 RDO 30 INPUT 1 ANADAT 40 PRINT 1 RPA 50 INPUT 1 PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA0 The variable names used in the INPUT 1 commands now contain the data sent by the ADR112 The data can now be scaled printed displayed saved or whatever is required by the application A BASIC PROGRAM EXAMPLE A complete BASIC program which reads analog port 0 and sets PAO if the analog port is above decimal value 2048 2 5 volts is shown below 10 OPEN COM1 9600 n 8 1 CS DS RS AS 1 opens and configures serial file 20 PRINT 1 CPA11111110 configures PAO as output 30 REM FORCES lt CR gt 40 PRINT 1 RESPAO resets PAO 50 REM FORCES lt CR gt 50 PRINT 1 RDO sends RAO command 60 INPUT 1 ANO receives data into variable ANO 70 IF ANO gt 2048 THEN PRINTZ1 SETPAO GOTO 50 sends SETPAO command if ANO gt 2048 and returns to line 50 80 PRINT 1 RESPAO GOTO 50 resets PAO and returns to 50 Visit our web page at www ontrak net for additional programming examples in BASIC Visual Basic and C 5 SENDING COMMANDS IN TURBO C TO THE ADR112 This section will demonstrate how to send and receive data from the ADR112 using TURBO C It outlines the commands used to configure the serial port bioscom send data out through the serial port fprintf and receive data through the serial port fscanf Commands u
11. ctor a male to male adapter is required to use the supplied cable This may be purchased at most computer dealers Apple Macintosh computers may be connected to the ADR112 using MAC to DB25 DTE conversion cable Once connected to the RS232 based host computer or terminal the RS232 port should be configured to the following specifications to allow communication with the ADR112 9600 baud 8 bit words 1 stop bit no parity If using BASIC or C consult the appropriate section in this manual for details on how to configure your serial port If a terminal or terminal emulation program is used configure your terminal to the above specifications using the operations manual for your terminal equipment or terminal emulation program ONTRAK CONTROL SYSTEMS INC 4 19 www ontrak net 2 PROVIDING POWER TO THE ADR112 The ADR112 may be powered using a regulated 5 volt power supply or a suitable wall adaptor POWER UP USING A 5 VOLT REGULATED SUPPLY If the ADR112 is to be powered using a regulated 5 volt MEM power supply the 5VDC and GND connections are to be made to the ADR112 via the main terminal block TB1 The supply must be able to provide minimum of 30 mA ONTRAK and up to 130mA if the ADR112 is to source current from ADR 2 SIMS the digital outputs Care must be taken to avoid 2 improper powe
12. ied by n n 0 to 7 RPA4 lt CR gt 1 is high Outputs decimal data ddd to PORT A Individual lines configured as input are not effected by this command ddd 000 to 255 MA255 lt CR gt All lines of PORT A are Returns status of PORT A in decimal format Individual lines configured as output will return last data set on PORT A PA lt CR gt 128 PAT is high PA6 thru PAO are low Resets I O line specified by n in PORT A This command has no effect on I O lines configured as input n 0 to 7 RESPA4 lt CR gt PA4 is reset Sets line specified by n in PORT A This command has no effect on I O lines configured as input n 0 to 7 SETPA3 lt CR gt is set 4 SENDING COMMANDS IN BASIC TO THE ADR112 OPENING A SERIAL FILE Commands may be sent to the ADR112 using a terminal emulation program such as Hyperterminal by simply entering commands and pressing cr With BASIC the ADR112 is connected to the computer via a serial cable and BASIC treats the ADR112 as a serial file Before commands can be sent to the ADR112 this serial file must be opened and initialized This should be done at the start of any program that is to access the ADR112 The command to open a serial file is shown below 10 OPEN COM 1 9600 n 8 1 CS DS RS AS 1 This line opens a serial file and labels it as serial file 1 This allows access to the ADR112 using PRINT 1 and INPUT 1 commands SENDING C
13. led The current loop s must be terminated using 250 ohm termination resistors connected between GND and ANO or AN1 Provision to mount the resistors on the PCB is provided using position R3 for ANO and R4 for AN1 Proper polarity must be observed ensuring the loop connection is connected to ground and the is connected to the selected analog input NOTE Improper polarity or lack of termination resistors may cause damage to the ADR112 analog inputs ALSO when two loops are used there is no isolation between loops as they share a common ground connection To calculate current levels read the port using the RDn command and use the following conversion Current reading 4095 X 20 ONTRAK CONTROL SYSTEMS INC 16 19 www ontrak net APPENDIX A CONNECTION DIAGRAM J1 RS232 DB9 FEMALE PIN2 GND PIN3 RC PIN7 TX ADRI 12 2 9VDC 2 1MM CENTER NEGATIVE PROTECTED ONTRAK CONTROL SYSTEMS i m TB1 gt gt gt gt N C Aa
14. m1 9600 baud 8 bit words no parity bioscom 0 settings com1 send RDO command to ADR112 on com1 fprintf stdaux RDO xD read data from com1 and store it at address of anO fscanf stdaux 9o6 d amp an0 initialize com 1 buffer rewind stdaux print data on screen printf ANALOG PORT 0 2 d n an0 PROGRAM EXAMPLE TWO DIGITAL PORT TEST PROGRAM include lt stdio h gt include lt bios h gt define 1 0 define settings OxE3 main declare PORTA and DOUT as integer numbers int PORTA DOUT set DOUT to integer 255 DOUT 255 configure com1 9600 baud 8 bit words no parity bioscom 0 settings com1 send CPA00000000 command to ADR112 on com1 fprintf stdaux CPA00000000 xD send MAddd ddd DOUT command to ADR112 on com1 fprintf stdaux MA d xD DOUT send PA command to ADR112 on com1 fprintf stdaux PA xD read data from com1 and store at address of PORTA fscanf stdaux 9o d amp PORTA initialize com1 buffer rewind stdaux print data on screen printf PORT A is d DECIMAL n PORTA ONTRAK CONTROL SYSTEMS INC 12 19 www ontrak net 7 Interfacing to the ADR112 Basic Examples The following show basic examples of interfacing various devices to the ADR112 Sample programs are written in BASIC and demonstrate proper command syntax A Reading Potentiometer Position To
15. monitor potentiometer position the potentiometer must be biased with 5VDC The wiper of the pot is then connected to one of the analog inputs The sample BASIC program reads the potentiometer position using the RDO command which responds with a decimal value between 0000 and 4095 The value is then converted to a percent and displayed on the video screen ADR112 260606060606 0 10 OPEN COM1 9600 N 8 1 CS DS RS AS 1 open com port 20 CLS clear screen 30 LOCATE 1 1 locate cursor 40 PRINT 1 RDO send RDO command to ADR112 50 INPUT 1 POT retrieve data from ADR112 60 POT POT 4095 100 convert data to percent 70 PRINT Potentiometer Position is POT display it 80 GOTO 30 repeat procedure B Connecting Switches to Digital Ports To connect switches to digital I O lines only one additional component is required Each digital input line used to read a switch must be tied to 5V via a 10Kohm resistor This is to avoid leaving the digital port floating when the switch is in the open position The switch is then connected between the digital port and ground The sample BASIC program first configures the digital I O lines as input and then reads the switches and displays their status on the video screen ONTRAK CONTROL SYSTEMS INC 13 19 www ontrak net ADR112 092926006060 gt gt 2 ANA IN uU U U V I gt gt gt gt gt gt gt
16. orces cr 50 PRINTZ1 CPA11111110 configures PAO as output 60 REM Turn on LED forces cr 70 PRINT 1 SETPAO turns on LED 80 REM Turn off LED forces cr 90 PRINT 1 RESPAO turns off LED 100 END PAO remains in high impedance state until the CPA command is used to configure the port as output D Driving Solid State Relays Solid State relays that require DC voltage to operate may be driven by ADR112 digital I O lines directly if the current input specification for the relay is 20mA or less The relay must be rated for the proper voltage and current required by the load Each relay requires one digital I O line to operate and requires no other external components In this configuration PAO sinks the relay drive current The sample BASIC program demonstrates how the relay is turned on Note that the I O line is SET before the CPA command is used to configure the port as output to avoid the relay turning on unexpectedly when the port is configured ADR112 090909060608 gt gt gt oa 2 M ANA IN DIGITAL 1 0 120VAC CONTROL 3 32VDC 10 OPEN COM1 9600 N 8 1 CS DS RS AS 1 opens com port 20 CLS clears screen 30 PRINT 1 SETPAO PAO 40 REM forces lt cr gt 50 PRINT 1 CPA11111110 configures PAO as output 60 REM Turn on relay forces lt cr gt 70 PRINT 1
17. r supply connection as permanent z RT m F damage to the ADR112 may result if connected 0 0 B B improperly No connection to J2 is to be made if the 00 ADR112 is powered by a regulated 5 volt supply EE 0 For safe operation the total current sourced by q digital O should not exceed 100MmA p ae DVAVA DSDS Z2222 DIGITAL 1 0 IN POWER REGULATED 5 VDC INPUT POWER UP USING A WALL ADAPTOR The ADR112 has an on board 5 volt regulator allowing the use of a 9 volt wall adaptor to power the internal circuits The regulator should be able to provide from 200 500mA MODE 68 950 1 The regulator must have MOG J2 9VDC a standard 2 1mm center negative coaxial connector 2 1MM The connector can then be inserted into J2 on the PROTECTER IVE ADR112 When the ADR112 is powered by a wall adaptor the on board regulator also provide regulated 5 volts DC out to provide power to external x ORAR circuits This 5 volt supply is available on TB1 The ADR 2 CONTROL fo i amount of current available depends on the amount of current sourced by the digital ports For safe operation the total current sourced by digital 1 0 and the power terminals should not exceed 100mA cj 2929260292609 BEEBEPEBEESEBSZIS a E DIGITAL 1 0
18. re is one eight bit digital port on the ADR112 labeled PORT A The individual I O lines are labeled PAO PA7 The following commands allow the user to configure individual bits as input or output SET or RESET individual bits read individual bits read entire port in binary or decimal format write to entire port in binary or decimal format The digital port commands are Configures each bit of PORT A All eight bits must be specified Order is MSB LSB x 1 for input 0 for output example CPA11110000 lt CR gt 7 PA6 5 PA4 are configured as inputs PA2 PA1 PAO configured as outputs SPAxxxxxxxx Outputs binary data to PORT A All eight bits must be specified Order is MSB LSB Individual bits configured as input are not effected by this command x21 or 0 example SPA10101000 lt CR gt ONTRAK CONTROL SYSTEMS INC 7 19 www ontrak net RPA example RPAn example MAddd example PA example RESPAn example SETPAn example ONTRAK CONTROL SYSTEMS INC 8 19 www ontrak net 5 set PA6 PA2 PA1 PAO are reset Returns status of all I O lines in PORT A in binary format Order is MSB LSB Individual lines configured as output will return last data set on the port RPA lt CR gt 01110010 PA2 PAO are low PA6 PAS PA4 PA1 are high Returns status of I O line in PORT A specif
19. sed in TURBO C to access the ADR112 require the following include files to be declared at the start of TURBO C programs include lt stdio h gt include lt bios h gt CONFIGURING THE SERIAL PORT The first step in accessing the ADR112 via the serial port is configuring the serial port to the proper communication parameters which are 9600 baud 8 bit words no parity This is done using the bioscom command The syntax for this command is bioscom O settings com1 where settings is previously defined as HEX and com1 is defined as 0 Defining settings and com 1 should be done using define com1 0 define settings OxE3 ONTRAK CONTROL SYSTEMS INC 10 19 www ontrak net These statements should be placed immediately following your include files see programming examples The bioscom command needs only to be executed once before the ADR112 is accessed SENDING COMMANDS TO THE ADR112 To send commands to the ADR112 the fprintf command is used For example the following command sends an RDO read analog port 0 command to the ADR112 fprintf stdaux RDO XD The WD suffix sends a carriage return after the command which is needed by the ADR112 to recognize a command Integer variables may also be used in the command line For example the following command sends a MAddd make port A ddd command where DOUT is a previously defined integer value of 0 to 255 fprintf stdaux MA 96d xD DOUT RECEIVING
20. trak net 1a THE ADR112 RS232 INTERFACE The ADR112 communicates via a standard RS232 port utilizing a simple three wire interface The only signals used are received data RC transmitted data TX and ground GND Most RS232 ports use hardware handshaking i e DTR DSR CTS RTS signals to control the flow of data on the port For this reason the cable required to connect to the ADR112 must have jumpers on the DB25 end to satisfy these handshaking requirements IBM or compatible computers may be used as a host computer with the supplied cable The supplied cable has the following connections ADR IBM etc DB9P male DB25S female RC 3 RED 2 TX TX 7 WHITE 3 RC GND 2 BLACK 4 RTS ws 1 5 CTS 4 6 DSR 7 GND 8 DCD 20 DTR Figure 1 Supplied Cable Wiring Diagram If the host computer has a 9 pin serial port connector a 9 pin to 25 pin adapter cable will be required to connect to the ADR112 cable This adaptor is available at most computer dealers If desired the DB25 connector on the supplied cable may be removed and a female DB9S connector can be soldered in its place using the following wiring diagram ADR IBM etc DB9P male DB9S female RC 3 RED 3 TX TX 7 WHITE 2 RC GND 2 BLACK 5 GND 7 RTS 8 CTS r 1 DCD r 6 DSR 4 DTR Figure 2 Modified Wiring Diagram For 9 PIN SERIAL PORTS If the host computer has a female DB25 conne
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