Honeywell DR4300 manual Troubleshooting Modbus Communications

Troubleshooting and Pen Alignment of Recorder with Display

8.5.10 Troubleshooting Modbus Communications

Procedure

Table 8-14explains 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	Refer to Section 4 - Configuration, Startup, and
	correct.	Operation of Recorder with Display.
3	Check that the device address is correct.	Refer to Section 4 - Configuration, Startup, and
	Each address must be unique. A recorder	Operation of Recorder with Display.
	with two pens must have a unique
	address for each pen channel.
4	Check that the communication wires are	Refer to Section 2 - Installation.
	properly connected to the J3 connector on
	the communication printed circuir
	assembly (PCA).
5	Verify that the communcation cable	Refer to Section 9 - Replacing Hardware
	connects J2 on the communication PCA	Assemblies.
	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.
6	Replace the communication PCA.	Refer to the replacement pocedure in Section 9 -
		Replacing Hardware Assemblies.

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