Modbus rtu serial communications, Relay connections, Relay4 relay3 – Precision Digital PD6200 User Manual
Page 22: Relay2 relay1, Voltage signal, Input signal, Input signal 3-wire voltage transducer, Figure 11: relay connections
Model PD6200 Analog Input Rate/Totalizer
Instruction Manual
22
-
+
+
Voltage
Signal
mA+
P-
2
1
3
5
4
P+
V+
COM
INPUT SIGNAL
mA+
P-
2
1
3
5
4
P+
V+
COM
INPUT SIGNAL
3-Wire Voltage
Transducer
Signal
-
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 P
RO
V
U
®
, use the PDA1232 for
RS-232, the PDA1485 for RS-422/485, or the PDA8008 for USB. The
same port is used for interfacing with all expansion modules (e.g. exter-
nal 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 cor-
responding relay. The relays’ C terminals should not be confused with
the COM (common) terminal of the INPUT SIGNAL connector.
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
Figure 11: Relay Connections