Setting Up Modbus Communications - GE Moisture monitor series 3 Programming Manual

March 2008
Setting Up Modbus
Communications
3-8
The MMS-3 can transmit stored data and displayed readings to a
remote ANSI terminal or a personal computer by using an external
RS232-to-RS485 converter. Any MMS-3 with software version
MMS3.STD.003.J and above has been modified to report
fundamental hygrometry data using MODBUS. The meter can transmit
the ten essential measurements using the MODBUS Read Holding
Register function.
To program the MMS-3:
Press the [PROG] key to enter the user program.
Note: If you have already entered the user program, see Figure 3-3
on page 3-49 to navigate to the Port Menu.
Enter Passcode: XXXX
Programming Menu
[PORT] ALARMS
Port Menu
BAUD [FORMAT]
Format Menu
PRINTER PANALINK [MODBUS]
Note: The MMS-3 will display the prompt "Enter Node ID" for
selection of a server ("slave") address.:
Enter Node ID
1
Press [NO] to exit the Node ID menu and again to exit the FORMAT
menu.
The FORMAT and BAUD options appear on the same level of the
programming hierarchy, but the communication mode, MODBUS,
must be set before selection of its transmission speed.
.
Enter the passcode
1 Use the arrow keys to move the
brackets to PORT and press
[YES].
1 Use the arrow keys to move the
brackets to FORMAT and press
[YES]
.
Use the arrow keys to select
MODBUS and press
Enter a number between 1 and
1
247.
Advanced Programming
[YES]
.