Rs-485 (4-Wire) & Rs-422 Operation; Dip Switch Settings & Pin Signals - HORNER HE200WCM910 User Manual

RS‐232/485 RF Modem Product Manual – MAN0782‐02
RS-485 (4-wire) & RS-422 Operation
DIP Switch Settings & Pin Signals
Wiring Diagram: RS-485 (4-wire) Half-Duplex
Figure 2.10.
RS‐485 (4‐wire) and RS‐422
DIP Switch Settings
Figure 2.12.
RS‐485 (4‐wire) & RS‐422 with Termination (optional)
Termination is the 120 Ω resistor between T+ and T‐.
DIP Switch settings are read and applied only while powering‐on.
Table 2.3. RS‐485/422 (4‐wire) Signals and their implementations with the RS‐232/485 RF Modem
RS-485/422
DB-9 Pin
Name
2 T- (TA)
3 R- (RA)
5 GND
7 R+ (RB)
8 T+ (TB)
9 PWR
1, 4, 6
Figure 2.13. RS‐232/485 RF Modem in an RS‐485 (4‐wire) environment
Description
Transmit Negative
Data Line
Receive Negative
Data Line
Signal Ground
Receive Positive
Data Line
Transmit Positive
Data Line
Power
Figure 2.11.
Pins used on the female RS‐232 (DB‐9)
Serial Connector
Implementation
Serial data sent from the RS-232/485 RF Modem
Serial data received by the RS-232/485 RF Modem
Ground
Serial data received by the RS-232/485 RF Modem
Serial data sent from the RS-232/485 RF Modem
Optional power input that is connected internally
to the front power connector
not used
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