CANgate User's Manual - dataTaker

More documents

Recommendations

Info

Connecting to an Existing CAN Network A typical CAN network might be wired as follows: ECU 1 120 Ω stub stub CAN-HI CAN-LO ECU 2 ECU 3 CANgate 2.6 KΩ DIAG PORT ECU 4 ECU 5 stub stub 120 Ω Typical layout of a vehicular CAN network In this case the vehicle has five ECUs connected to the CAN bus, plus a diagnostic connector. ECUs 1 and 5 are at the ends of the main bus, so they incorporate termination resistors. ECUs 2, 3 and 4 connect to the bus via short stub connections and do not include a termination resistor. Notice that CANgate incorporates weak termination (2.6k Ω). This value is high enough so as not to significantly increase the DC load on the already terminated bus, yet low enough to provide some damping of reflections on CANgate's stub connection to the bus. This allows the length of the stub to be extended to around 2-3 metres. Note that some of the ECUs may also include weak termination to allow their stub connections to be extended slightly. Connecting to a Single ECU If CANgate is connected to a single ECU (eg for laboratory testing) then an external termination resistor may be required CANgate 2.6 KΩ 60 Ω ECU Direct connection to a single ECU In this case a short (1m) cable is used so the two 120 Ω resistors are combined into one 60 Ω resistor. If a long cable is used then 120 Ω resistors should be placed at each end. This assumes that the ECU is not terminated (or weakly terminated). If the ECU includes its own 120 Ω termination then an external 120 Ω resistor is only required at the CANgate end of the cable. Note that if the cable is short and the bit rate moderate then you may well get away with no external termination, ie. CANgate's internal weak termination may be adequate. Inside CANgate Accessing CANgate Internals If it is necessary to alter the settings on the internal DIP switch then CANgate will need to be disassembled, as follows: 1. Disconnect any cables from the CANgate connectors. 2. Remove the two Philips-head screws on the right hand ("Host RS232") end of the case. 3. Remove the aluminium end plate and plastic surround. 4. Push on the connector at the other end of the case. The printed circuit board (PCB) should slide out. UM-0086-A2 CANgate User’s Manual Page 10
To reassemble: 1. Slide the printed circuit board into the topmost slot in the case (the one closest to the front panel label). The male DE9 should be at the right hand ("Host RS232") end of the case. Note: It is normal for one of the solder connections on the PCB near the male DE9 connector to make contact with the case. 2. Replace the plastic surround, then the end plate. 3. Fasten the two screws CANgate internal view Configuration Switches By default, the CANgate's host RS232 port is configured for 57600 baud, hardware flow control (RTS/CTS), 8 data bits, no parity, 1 stop bit. This should be suitable for most applications, however these settings can be changed by setting the internal DIP switch, as shown below. The factory default is all switches OFF. Switch 1 Switch 2 Switch 3 Switch 4 Switch 5 Switch 6 Switch 7 Switch 8 Host port 57600 off off off x x x x off baud rate 38400 off off ON x x x x off 19200 off ON off x x x x off 9600 off ON ON x x x x off 115200 ON off off x x x x off Host port hardware x x x off x x x off flow control software x x x ON x x x off Factory Defaults ON ON ON ON ON ON ON off Bootstrap Mode x x x x x x x ON Note: Switch numbers refer to the numbers printed on the switch itself. Ignore the labels marked on the printed circuit board. Note: The switch settings are only checked immediately after power up. Changing the switches during operation has no effect. The Factory Defaults setting can be used to force CANgate to revert to a factory default state, ie. verbose mode off, both CAN ports disabled, GPS baud rate 4800, all memory slots cleared. Set the switches as indicated above (ie. switches 1-7 ON), then cycle the power – all LEDs should illuminate briefly – then return the switches to their normal setting and cycle the power again. The Bootstrap Mode switch provides an alternative way of entering Bootstrap Mode, which is only used when upgrading CANgate firmware. UM-0086-A2 CANgate User’s Manual Page 11
Page 1 and 2: ~® Intelligent Data Logging Produc
Page 3 and 4: Contents Contents .................
Page 5 and 6: Introduction About CANgate CAN (Con
Page 7 and 8: CANgate Hardware Connectors and LED
Page 9: CAN/GPS/Power Connections The suppl
Page 13 and 14: Memory Slot Commands and Protocol H
Page 15 and 16: Command Summary { slot } RECV CANpo
Page 17 and 18: RECV 1 0x603 3.8 3.5 ALL FORMAT .25
Page 19 and 20: RECVJ - Receive J1939 Messages wher
Page 21 and 22: Examples GPS "GPGLL" 1 D 5000 Recei
Page 23 and 24: RP - Poll Memory Slot RP { slot1 sl
Page 25 and 26: protocol used to break up and reass
Page 27 and 28: Example STATS HOST: Tx:218408 Rx:12
Page 29 and 30: Data Range: 0 to 8031.875 rpm Type:
Page 31 and 32: mode byte and the PID. RQST 1 010C
Page 33 and 34: The flip-side of this capability is
Page 35 and 36: Requested CAN data are not returned
Page 37 and 38: Upgrading CANgate Firmware From tim
Page 39 and 40: Power Supply External Input Range:
Page 41 and 42: 15-17 2 …as above for Bank 1 sens

CANgate User's Manual - dataTaker

Create successful ePaper yourself

Delete template?

Save as template?