User manual

1 Publication AG-UM008C-EN-P - February 2005

Appendix

Basic DF1 Protocol Troubleshooting

Appendix Objectives

This appendix helps you troubleshoot communication problems.

General Tips

When you encounter problems, check these items:

• cabling (cable length, connectors, pinouts, etc.)

• power connections

• communication rate settings for all devices must match

• control line configuration

• handshaking parameters

• error detection selection for all devices must match

(BCC or CRC)

Communication

Troubleshooting

For new installations, if possible, setup the communications in the lab

before installing the processors in the field using a directly connected

null-modem cable. Verify that the protocol settings and addressing are

properly configured for all processors. For multi-drop configurations,

you need only verify Master-to-Slave communications. Next, replace

the null-modem cable with modem cables and introduce the modems

as the link between the devices. Troubleshoot the modem link(s).

For information about See page

general tips B-1

communication troubleshooting B-1

DF1 half-duplex protocol B-4

DF1 full-duplex protocol B-6

DF1 radio modem protocol B-7