Flowserve MX-100 Field Unit - Manual (Page 40)

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11
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3.3.1.2 Changing DDC Parameters
Enter the “CHANGE SETTINGS” mode and “CHANGE DDC?” as detailed in Bulletin LMENIM2306, MX Installation
and Operation Manual. The following parameters may be changed:
Status (ON or OFF) •
Protocol (Baud Rate) •
DDC Address •
Analog Scale •
ESD Action •
Proportional Band •
Deadband •
Offset •
Move To •
Comm Loss Delay •
Comm Loss Action •
Each parameter is discussed below:
Status (ON or OFF)
This parameter activates or deactivates the field unit.
NOTE: When the field unit is installed at the factory, the default status is ON. If DDC status is OFF, the LCD screen will
display “XXX% OPEN, DDC OFF.”
Use the black control knob to select “NO,” which toggles the field unit OFF and ON.
If DDC option is ON, the Modutronic option must be OFF. Use the Modutronic option to configure the proportional
band and deadband for “move-to” control.
Protocol (Baud Rate)
The protocol and baud rate selected depend on the system design. All field units and the host system/Master Station
II must have the same protocol and baud rate.
1. Using the black control knob, actuate “NO” to change the protocol/baud rate.
Possible selections are:
MODBUS RTU 19.2k BAUD •
MODBUS RTU 9600 BAUD •
MODBUS RTU 4800 BAUD •
MODBUS RTU 2400 BAUD •
MODBUS RTU 1200 BAUD •
MODBUS ASCII 19.2k BAUD •
MODBUS ASCII 9600 BAUD •
MODBUS ASCII 4800 BAUD •
MODBUS ASCII 2400 BAUD •
MODBUS ASCII 1200 BAUD •
NOTE: All field units must have same configuration–either RTU or ASCII.
2. Select “YES” to choose the proper protocol/baud rate.