Precision Digital PD6830 - Manual (Page 23)

PD6830 Pulse Input Rate/Totalizer Instruction Manual
23
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 10.
Figure 10. 4-20 mA Output Connections
RS-485 Serial Connections
The meter may include an optional RS-485 two-wire serial connection. The cabling
used for an RS-485 serial communications network should always be a high quality
cable such as Belden 8162 or Alpha 6203C. A two-wire system requires two twisted
pairs, and a four-wire system requires three twisted pairs (the extra twisted pair is
needed for the signal ground).
Figure 11. RS-485 2 Wire Serial Connections
Figure 12. RS-485 4 Wire Serial Connections
LP- LP+
Power
Supply
4-20 mA Input
Device
ProtEX
DATA
DATA
GND GND
RS-485 DEVICE
DATA
DATA
ProtEX
DATA
DATA
DO
DO
DI
DI
GND
GND
RS-485 DEVICE