5.2.2 RS-232 Interface (EIA574)
RB600 terminal is equipped with an RS-232 interface (as shown below). A DE9 DSUB
socket is connected via a voltage level translator circuit to the GSM module.
Table of RS-232 DB9 pins:
Pin No.
Name
Dir
Description
1
DCD
IN
Data Carrier Detect. Raised by DCE when modem
synchronized.
2
RD
IN
Receive Data (a.k.a RxD, Rx). Arriving data from DCE.
3
TD
OUT
Transmit Data (a.k.a TxD, Tx). Sending data from DTE.
4
DTR
OUT
Data Terminal Ready. Raised by DTE when powered on. In
auto-answer mode raised only when RI arrives from DCE.
5
SGND
-
Ground
6
DSR
IN
Data Set Ready. Raised by DCE to indicate ready (optionally
RS485 A)
7
RTS
OUT
Request To Send. Raised by DTE when it wishes to send.
Expects CTS from DCE.
8
CTS
IN
Clear To Send. Raised by DCE in response to RTS from DTE.
9
RI
IN
Ring Indicator. Set when incoming ring detected - used for auto-
answer application. DTE raised DTR to answer (optionally
RS485 B)
DE-9 (EIA/TIA 574)
View of the female connector
10
Summary of Contents for RB600
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