Dwyer Instruments Series APM Instruction Manual download pdf (Page 22)

Analog Panel Meter Instruction Manual

Figure 10: 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 6. For interfacing to the APM, 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 6. 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 11: Relay Connections

CNONO NC NC C

RELAY4 RELAY3

4365 21

CNONO NC NC C

RELAY2 RELAY1

4365 21

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Dwyer Instruments Series APM Instruction Manual Page 22