5-27
RS-485 Communication Test
The following RS-485 Serial Communication Test procedure is directed from
Figure 5–8
and
will assist the user in what may be the possible cause for indicated error message.
Before performing this test, please verify that the field wiring (see Table 5–4)is correct.
When troubleshooting RS-485 mode, verify termination settings of COMM
1 J7 and COMM 2 J10 on XRC Board are correctly jumpered (see Table
5–5).
Table 5–4 RS-485 Field Wiring on XRC-195 Board
Description
PIN
J6–COMM 1 and 2
1
V Battery
2
Ground
3
Switched V Battery
4
Operate
5
RRTS Remote Request to Send
6
Bus (-)
7
Bus (-)
8
Bus (+)
9
Bus (+)
Table 5–5 RS-485 Terminations
Serial Comm Port
1
2
Jumper J7
J10
First or Intermediate Unit
Pins 2–3
Pins 2–3
Last or Only Unit
Pins 1–2
Pins 1–2
RS-485 Communication Test
Before performing this test on the XRC-195 Board, please verify that the wiring is correct
(see Table 5–4).
Voltage on the following steps may be hard to see using a Digital
Multimeter. If available, an oscilloscope will provide a more accurate
reading. To verify, the Host software must be continuously polling the
meter.
Continued on Next Page
Summary of Contents for XRC6490
Page 1: ...2100802 001 AB TOTALFLOW XSeries Remote Controller User s Manual ...
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Page 19: ...1 5 Standard Enclosure Cont RC 6790 X Figure 1 2 Model XRC6790 Continued on Next Page ...
Page 41: ...1 27 Totalflow Input Output Modules Cont Figure 1 16 XRC6990 Inside View ...
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Page 86: ...4 12 Replacing XRC 195 Board Cont Figure 4 5 XRC Board Connections ...
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Page 112: ...5 24 12V Communication Supply Voltage Test Cont Figure 5 9 XRC 195 Communication Wiring ...
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