Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 347)

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