Model PD6300 Pulse Input Rate/Totalizer
Instruction Manual
24
Modbus RTU Serial Communications
Serial communications connection is made to an RJ45 connector labeled
M-LINK on Figure 6. For interfacing to the P
RO
V
U
®
, use the PDA1232 for
RS-232, the PDA1485 for RS-485, or the PDA8008 for USB. The same
port is used for interfacing with all expansion modules (
e.g.
external
relays, digital I/O).
Use the PDA1200 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
C
NO
NO
NC
NC
C
RELAY4
RELAY3
4
3
6
5
2
1
C
NO
NO
NC
NC
C
RELAY2
RELAY1
4
3
6
5
2
1
