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2. Interfacing Protocols
RS-232 Operation
DIP Switch Settings & Pin Signals
The RS-232/485 RF Modem supports the following interfacing protocols:
•
RS-232
•
RS-485 (2-wire) Half-Duplex
•
RS-485 (4-wire) and RS-422
Figure 2.1.
RS‐232 DIP Switch Settings
DIP Switch settings are read and applied
only while powering‐on.
Table 2.1. RS‐232 Signals and their implementations on the RS‐232/485 RF Modem
(Low‐asserted signals are distinguished by horizontal line over pin name.)
RS-232
DB-9 Pin
Name
1
DCD
2
RXD
3
TXD
4
DTR
GPI2 / SLEEP
5
GND
6
DSR
GPI1 /
7
/ CMD
GPO1 /
8
RS-485 TX EN
9
RI
* Inside the RS‐232/485 RF Modem is an OEM RF Module. The names in this column refer to the pin signals of
the embedded module. RS‐232/485 Commands [p32] used to configure pin behaviors are named according to
the pins of the module, not the RS‐232 connection.
RS‐232/485 RF Modem Product Manual – MAN0782‐02
Module
Description
Name*
GPO2 /
Data-Carrier-Detect
RX LED
DO
Received Data
DI
Transmitted Data
Data-Terminal-Ready
-
Ground Signal
GPO2 /
Data-Set-Ready
RX LED
/
Request-to-Send
CMD
/
Clear-to-Send
-
Ring Indicator
Figure 2.2.
Pins used on the female RS‐232 (DB‐9)
Serial Connector
Implementation
Connected to DSR (pin6)
Serial data exiting the RF Modem (to host)
Serial data entering into the RF modem (from host)
Can enable POWER-DOWN on the RF Modem
Ground
Connected to DCD (pin1)
Provides
flow control or
enables "Command Mode" on the RF Modem
Provides
flow control
Optional power input that is connected internally to the
positive lead of the front power connector
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