PD6830X Explosion-Proof Modbus Scanners
Instruction Manual
14
Wiring Diagrams
DC Power Connection
DC power is wired to terminals P+ and COM as shown
in Figure 5. To maintain input isolation, a separate
power supply must be used to power the isolated
4-20 mA transmitter as shown in Figure 6.
Figure 5. DC Power Connections
4-20 mA Transmitter Output
Connections
Output connections are made to two terminals labeled
LP+ and LP-. Connect to an input device such as a
remote display or chart recorder as shown in Figure 6.
Figure 6. 4-20 mA Output Connections
RS-485 Signal Connections
The scanner includes a 3-wire RS-485 serial connec-
tion. The cabling used for an RS-485 serial communi-
cations network should always be a high quality cable
such as Belden 8162 or Alpha 6203C. A 3-wire sys-
tem requires two twisted pairs (the extra twisted pair
is needed for the signal ground).
Figure 7. RS-485 3-Wire Serial Connections
Figure 8. RS-485 5-Wire Serial Connections
Open Collector Output Connections
Open collector output 1 and 2 connections are made to
terminals labeled OC1+ and OC1-, and OC2+ and
OC2-. Connect the alarm or pulse input device as
shown in Figure 9.
Figure 9. Open Collector Output Connections
Power
Supply
COM RST
P+
S+
S-
LP-
LP+
Power
Supply
4-20 mA Input
Device
ProtEX
RS-485 DEVICE
D+
D-
G
DATA
DATA
GND
ProtEX
DO
DO
DI
DI
GND
RS-485 DEVICE
D+
D-
G
+
Alarm Indicator/
Pulse Counter
(e.g. PD6300)
-
5-30 VDC
150 mA MAX
P+
COM
RST
S+
S-
OC1+ OC1- OC2+ OC2-
LP+
LP-
