EDP-AM-CO1 Communications Module User Manual Version v4.0
Contents
1. from the backplane pass through a transient suppressor before exiting the RS EDP system via a min USB connector P303 Most of the CPU modules that support CAN have a local CAN transceiver on board and hence provide the option to supply either the TTL levels CANOTX amp CANORX or the physical layer signals CANH and CANL The CANH amp CANL physical layer signals are routed directly onto the 9 way D connector on the Communications Module For normal operation the user would use the local CAN transceiver on the CM and then route the physical layer CANH and CANL signals down the backplane The physical layer CAN traffic is then accessed via the 9 way D connector on the Communication Module If the user would like isolated CAN traffic then the user would normally set up the Command CPU Module to output TTL level CAN traffic CANOTX and CANORX instead This TTL level traffic is then routed via jumper on the Communications Module to a physical layer device which is electrically isolated from the RS EDP system This floating CAN output is available on the P204 connector which the user can then attach a 9 way D connector in the normal fashion to access the traffic In situations where the main CPU module has two CAN channels then the first CAN channel CANO is set up for use with the local CAN transceiver on the CM This will provide the CANOH and CANOL physical layer signals that will appear on the 9 way D connector on the Communications Modules The seco2. installations where no load resistor is present J306 allows a default one to be made available 1 3 USB Interface The AM unit provides support for USB Device class only and does not provide any support for Host class The AM board provides a physical layer transient surge arrestor designed specifically to work with high speeds found in USB communication The USB interface works with those CMs that have a USB peripheral on board that has been mapped to the RS EDP backplane USB bus signals 1 4 Real Time Clock IC The AM module is fitted with an DC based Real Time Calendar Clock IC The device has an on board 32KHx watch crystal that maintains real time clock information The device can be battery backed up via a battery fitted to the Base Board Interfacing to this device is done via the CNTRL_I2C signals All of the CMs currently designed are able to communicate to this device with this interface A set of software drivers is provided for each of the CM to allow easy access to this device A driver library provides software support for setting up sand configuring the RTC clock as well as displaying the information etc 2 User Jumpers And Connectors User configurable jumpers P205 Isolated CAN traffic selector P205 1 3 CANOTX TTL traffic is routed to the isolated CAN transceiver P205 3 5 CAN1TX TTL traffic is routed to the isolated CAN transceiver P205 4 6 CANORX TTL traffic is routed from the isolated CAN transceiver P2
3. 05 2 4 CAN1RX TTL traffic is routed from the isolated CAN transceiver J302 amp J303 Jumper Options ASC1 RS232 RS485 Selector J302 2 3 ASC1 output is RS232 Rx Signal J302 1 2 ASC1 output is RS485 B Signal J303 2 3 ASC1 output isRS232 Tx Signal J303 1 2 ASC1 output is RS485 A Signal J304 Real Time Clock Address Select J304 1 2 AO I2C Slave Address line is set high J304 2 3 AO DC Slave Address line is set low Default Changing the RTC salve DC address may be required if there are other I2C devices in the system that shares the same 2C address Refer to the data sheet for the PCF8583T for the 12C address settings Electrocomponents plc Page 4 EDP AM CO1 Manual P303 USB device direct from CM J203 Opto coupled CAN load resistor P201 CANOH amp CANOL 9 D direct from CM P205 Route CANO or CAN1 to opto coupled J Se CAN on P204 305 0 4 J304 Select RTC amp TX 9 D direct oC ee from CM J306 Add RS485 120R resistor J302 P301 p3 is ASC1 RX or RS485 line B J303 P301 pb is ASC1 TX f or RS485 line A P302 ASCO RX P301 ASC 1 RX a TXdirectfrom CM amp TXor RS485 A amp B CO1 Communications Module to RS EDP Backplane J305 amp J302 UARTO RS232 ASCOTX TIL gt _ gt 3 poro gt AScoTx ASCORX TIL lt _ _ ___ DEE K e ascorx S P301 UART1 SNE ec kang RS485 or RS232 ASCIRX TTL ASCI1RX TTL ASCODSR i RS4
4. 70 RxDO Vcc 5V from reg NC P1 1 PHY Disabled P3 1 P1 0 PHY Disabled P5 0 P5 1 5V from baseboard regulator Vcc 3V3 from reg 3V3 from baseboard regulator XC167 Pin Allocation Vcc to BB Vcc 3V3 or 5V supplied by CM Digital GND Vcc 5V from reg Digital GND 5V from baseboard regulator 3V3 Vbatt Vcc 3V3 from reg 3V3 Vbatt 3V3 from baseboard regulator XC167 Pin Allocation STR9 Pin Allocation Vcc 5V from reg Vcc 5V from reg Vcc 3V3 or 5V supplied by CPU Vcc 3V3 from reg NC USBDN NC USBDP Vcc 3V3 from reg Digital GND 25 SDA2 26 SCL2 CANLO CANHO 87 CAN1 TX 84 CAN1 RX Digital GND P2 1 P2 0 CANLO CANHO P3 2 P3 3 3 Software Support Vcc 3V3 or 5V supplied by CPU a STR9 Pin Allocation EDP AM CO1 Allocation Vcc 3V3 or 5V supplied by CM IRQ GPI016 CNTRL 12C INT Digital GND CANT TX CAN1 RX ASC1 TX TTL ASC1 RX TTL_ASCO DSR ASC1 RX TTL ASCO TX TTL ASCO RX TTL 5V from baseboard regulator 3V3 from baseboard regulator STR9 Pin Allocation EDP AM CO1 Allocation Vcc 3V3 or 5V supplied by CM Digital GND 5V from baseboard regulator 3V3 Vbatt 3V3 from baseboard regulator EDP AM CO1 Allocation Vcc 5V from reg Vcc 3V3 or 5V supplied by CPU Vcc 3V3 from reg USB DEV D USB DEV D Digital GND CNTRL DC SDA CNTRL 12C SCL CANLO CANHO CANO TX CANO RX The Communication Module is supported with the appropriate driver software for the respect
5. 85 Enable i USBDEV USBDEV ASC1TX ASC1RX P303 Mini USB Bia o D CANOH mn lt gt 8 CANOL Uo SE P201 Straight through CAN S cano CAN1TX lt _ Ea CAN1RX P204 Isolated CAN GPI016 NANA ON o ca m 12 SE _ i VDDBAT ao Mapping of the Communications module to the backplane The TTL levels for ASCO are converted in to RS232 levels by the level shifter on the CO1 AM The output of this serial channel is on the 9 way D connector The ASC1 TTL levels can be converted to either RS232 levels or RS485 levels by selecting the appropriate jumpers To use RS485 successfully an additional third control signal is required This is Electrocomponents plc Page 5 EDP AM CO1 Manual because RS485 is half duplex and hence it cannot transit whilst receiving To control the flow a third signal is required which is bought in from the backplane called ASC1RX_TTL_ASCODSR Not all of the CPU Modules provide support for this signal so please check with the CM to see if this signal is made available The output of this serial ASC1 channel is available on the P301 connector The user should connect a D connector to this wired for RS232 or RS485 appropriately Note RS485 and RS232 have different pinning arrangement on the 9 way D connector so check on line for the correct pin out for this The USB Device signals USBDEV and USBDEV
6. CAN Low signals ready for interfacing to an existing CAN network CANO may also be routed through a galvanically isolated CAN physical layer emerging on P204 and selectable via P205 If this is required CANO TX and RX connections to the CPU on the CM must be isolated via jumpers on the CM itself please refer to the user manual for the CM fitted The isolated physical layer has its own 5V DC DC convertor so that the EDP system can float relative to other CAN devices If the CM has a second CAN channel CAN1 this can also be routed through the galvanically isolated CAN physical layer via P205 An optional 120R CAN terminating resistor can be added via solder bridge J203 1 2 Serial Interfaces 1 2 1 RS232 Interfaces Asynchronous serial channel 0 from the CPU appears as RS232 level signals on the J305 9 D connector To allow the RS232 connector be mounted away from the EDP hardware the same signals are available on P302 A simple PC style IDC 9D connector on a ribbon cable can be used For CMs that have a second asynchronous port it can be routed to P301 where a PC style IDC 9 D with ribbon cable can be used Alternatively it can be connected to an RS485 transceiver via jumpers J302 and J303 Electrocomponents plc Page 3 EDP AM CO1 Manual 1 2 2 RS485 RS485 communications are supported using a Linear Technology LTC485 To make use of this option the CM software must operate the Receive Enable Data Enable control line In RS485
7. EDP AM CO1 Communications Module User Manual Version v4 0 24 03 2010 This document contains information on the CO1 communications IO module for the RS EDP system EDP AM CO1 Manual Contents 1 Communications Module EDP AM C01 1 1 Controller Area Network Interfaces CAN 1 2 Serial Interfaces 1 2 1 EE Elle 1 2 2 a AO 1 3 USB Interface EE 1 4 Real Time Chocktt 2 User Jumpers And Connectors 2 1 Mapping Of CPU Pins To The Communications Module 3 Software Support Electrocomponents plc Page 2 a EDP AM CO1 Manual 1 Communications Module EDP AM C01 This module allows the easy interfacing to the following communication devices present on the CM Comms Type Channel No Connector Name Comment RS232 ASCO 9D Male ASCO 5x2 Header RS232 ASC1 5x2 Header p3 RX p5 TX RS485 ASC1 5x2 Header p3 RX p5 TX USB USB mini device USB DEV socket Where available on CM CAN CAN CNTRL 9D Female 120R on baseboard CAN CAN CNTRL 5x2 Header Opto isolated CAN CAN CAN1 5x2 Header Opto isolated CAN It also carries a PCF8583 real time clock device on the I2C bus and 240 bytes of non volatile data storage powered from the optional lithium battery on the EDP baseboard Note Only one communications module may be fitted to a baseboard at any one time 1 1 Controller Area Network Interfaces CAN The first CAN channel CANO from the CM where available is routed through the 9 D female connector as CAN High and
8. ive CM As there are several CPU Modules each with its own CPU type there exists many versions of the software to exercise the Communication Module The software provides a supported library for CAN where appropriate the Real Time Clock set up and configuration and the UART drivers Support for the USB is not currently Electrocomponents plc Page 7
9. nd channel will be set up to output TTL level traffic on CAN1Rx and CAN1TX This traffic is then routed via the backplane to the Communications module where it is then selected via jumper to enter the isolation circuit and physical layer CAN transceiver CANT isolated physical layer traffic is therefore available on P204 The AM also has on board a Real time clock device which is supported during power down by a battery on the Base Board The RTC can be accessed via the CNTRL 12C 12C bus The AM also provides an interrupt line to the MCU to provide wake up etc from RTC alarm events etc 2 1 Mapping Of CPU Pins To The Communications Module The connectors on the Communications Module are connected to the CPU module as shown below Only two examples are shown one for the STR9 module and one for the XC167 module Please note that the USB device connector is inactive when the XC167 module is fitted and that that the second serial port is not available when the Ethernet PHY is enabled on the STR9 module Finally there is no second CAN channel available with the STR9 as the MCU does not have a second CAN peripheral Each of the CMs are different in capability and hence not all of the resource on the AMs is available to all CMs Electrocomponents plc Page 6 EDP AM CO1 Manual XC167 Pin Allocation Vcc to BB Vcc 3V3 or 5V supplied by CM P3 2 Digital GND P5 6 Digital GND 86 CANO TX NC 85 CANO RX 60 RxD1 P20 2 59 TxD1 69 TxDO
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