12-13-2005 04:52 PM
12-13-2005 08:54 PM
Ken,
The timeout response indicates that no message was received back from the network module. This is most commonly due to incorrect wiring or communication settings (e.g. wrong baud rate). Thus, a reset will typically not work. Since one of your FP-1001's is responding and the other isn't, I would check how they are both wired (computer Tx+ should be wired to Rx+ of both FP-1001s, computer Tx- to Rx- of both FP-1001s, computer Rx+ to Tx+ of both FP-1001s, and computer Rx- to Tx- of both FP-1001s). Check that the RS-485 connector is firmly inserted into the module, that the biasing resistors have not been damaged, and that you have full wiring connectivity. You could swap the two FP-1001s to see if the problem follows the FP-1001 or remains in the same position. Also, make sure that both FP-1001's have been set to the same baud rate but different addresses via the dip switches. If you change the baud rate or address via the dip switches, you MUST cycle power to the FP-1001 for the new settings to take effect.
When troubleshooting communications, you can look at the Network and Access LEDs. Network indicates that there is serial port activity on the RS-485 bus, but not necessarily directed at the specific FP-1001 (or attached modules). The Access LED indicates serial activity that has specifically addressed the FP-1001 or its attached IO modules.
Regards,
Aaron
12-14-2005 12:58 PM
12-14-2005 10:23 PM
Ken,
Since the problem remains in the same spot, I would check:
Regards,
Aaron
12-15-2005 12:02 PM