
7
Service and Maintenance
7-11
Series 370 Stabil-Ion Instruction Manual - 370119
7.13 RS-485 Troubleshooting
In the event of problems with the RS-485 communications verify the following items for proper
configuration.
1.
Check configuration switch settings.
Ensure the baud rate, character framing, and interface protocol are matched to the host computer or
terminal’s requirements. Note that there may be several mismatched parameters.
2.
Check command format.
Ensure that the command strings output from the host computer or terminal to the Series 370 Controller
are in accordance with the syntax defined by this addendum.
7.14 Field Installation of Modules
1.
Turn OFF power.
2.
With power OFF, remove any cables from the Control Unit rear panel.
3.
Observe antistatic precautions to avoid damaging static sensitive components inside the
chassis. Use a grounded, conductive work surface. Do not handle MOS devices more than
absolutely necessary, and only when wearing a high impedance ground strap. Use conductive
envelopes to store or ship MOS devices or printed circuit boards. Do not operate the 370
Controller with MOS devices removed from the printed circuit boards.
4.
See Section 2.1.1 on page 2-2 for how to remove the top cover.
5.
Locate correct position for module.
Table 7-9
RS-485 Troubleshooting Guide
Symptom
Possible Cause
Micro-controller reset LED CR1
illuminated or flashing
Micro-controller failure.
No response or garbled output
Baud rate incorrect, character length incorrect, character framing
incorrect, or bias resistors do not exist or are incorrect.
Intermittently will not respond
Poor cable connections, ground fluctuations (the maximum common
mode potential across the system is 7 volts) and EMI from other sources.
Bias resistors do not exist or are incorrect. If the start character is not
received properly, the Series 370 controller may not interpret it as a start
character and the controller will not respond. Host software must be
prepared to re-send a command if a response is not generated within a
reasonable period of time.
OVERRUN ERROR message
Stop bit(s) incorrect, host software failure.
PARITY ERROR message
Parity incorrect.
SYNTAX ERROR message
Message to 370 Controller not in accord with specified syntax.
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