Troubleshooting and Pen Alignment
of Recorder with Display
4/00 DR4300 Circular Chart Recorder Product Manual 187
8.5.10 Troubleshooting Modbus Communications
Procedure
Table 8-14 explains what to do if Modbus communications are not successful.
Table 8-14 Troubleshooting Modbus Communications
Step What to do How to do it or
where to find the instructions
1
Verify that communications are enabled. Refer to Section 4 - Configuration, Startup, and
Operation of Recorder with Display.
2
Check that the configured baud rate is
correct.
Refer to Section 4 - Configuration, Startup, and
Operation of Recorder with Display.
3
Check that the device address is correct.
Each address must be unique. A
recorder with two pens must have a
unique address for each pen channel.
Refer to Section 4 - Configuration, Startup, and
Operation of Recorder with Display.
4
Check that the communication wires are
properly connected to the J3 connector
on the communication printed circuir
assembly (PCA).
Refer to Section 2 - Installation.
5
Verify that the communcation cable
connects J2 on the communication PCA
to J3 on the PCA for Pen 1. The PCA for
Pen 1 is on the right when facing the
recorder.
If communication is used for Pen 2,
another communication cable must
connect J1 on the communication PCA
with J3 on the PCA for Pen 2.
Refer to Section 9 - Replacing Hardware
Assemblies.
6
Replace the communication PCA. Refer to the replacement pocedure in Section 9 -
Replacing Hardware Assemblies.
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