User guide

Multi Process Meter Instruction Manual

Figure 11. Voltage Input Connections

The meter is capable of accepting any voltage from -10 VDC to +10 VDC.

Modbus RTU Serial Communications

Serial communications connection is made to an RJ45 connector

labeled M-LINK on Figure 7. For interfacing to the MPM, use the PMA-

01 for RS-232, or the PMA-03 for RS-485. The same port is used for

interfacing with all expansion modules (e.g. external relays, digital I/O).

Use the PMA-02 meter copy cable for meter-to-meter interfacing for

cloning purposes (i.e. copying settings from one meter to other meters).

Relay Connections

Relay connections are made to two six-terminal connectors labeled

RELAY1 – RELAY4 on Figure 7. Each relay’s C terminal is common

only to the normally open (NO) and normally closed (NC) contacts of the

corresponding relay. The relays’ C terminals should not be confused

with the COM (common) terminal of the INPUT SIGNAL connector.

Figure 12. Relay Connections

CNONO NC NC C

RELAY4 RELAY3

4365 21

CNONO NC NC C

RELAY2 RELAY1

4365 21