ProtEX-MAX PD8-6310-WM Explosion-Proof NTEP Certified Batch Controller Instruction Manual
20
Three Wire Connections
In order to wire the 5 pins for use as a 3-wire half-duplex RS-485 connection, it is necessary to create a
jumper connection between DI
– DO and DI- – DO- as shown below.
Figure 17. Three-Wire RS485 Connection
Figure 18: RS-485 Wiring
Notes:
1. Termination resistors are optional and values depend on the cable length and characteristic im-
pedance. Consult the cable manufacturer for recommendations.
2. Refer to RS-232 to RS-485 Converter documentation for further details.
3. Use shielded cable, twisted-pairs plus ground. Connect ground shield only at one location.
WARNING
Observe all safety regulations. Electrical wiring should be performed
in accordance with all agency requirements and applicable national,
state, and local codes to prevent damage to the meter and ensure
personnel safety.
F4
COM
DI
DI
DO
DO
T X
RX
1 2 3 4 5
1 2
