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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
1
DCD
2
RD
3
TD
4
DTR
5
SGND
6
DSR
7
RTS
8
CTS
9
RI
10
Dir
IN
Data Carrier Detect. Raised by DCE when modem
IN
Receive Data (a.k.a RxD, Rx). Arriving data from DCE.
OUT
Transmit Data (a.k.a TxD, Tx). Sending data from DTE.
OUT
Data Terminal Ready. Raised by DTE when powered on. In
auto-answer mode raised only when RI arrives from DCE.
-
IN
Data Set Ready. Raised by DCE to indicate ready (optionally
OUT
Request To Send. Raised by DTE when it wishes to send.
IN
Clear To Send. Raised by DCE in response to RTS from DTE.
IN
Ring Indicator. Set when incoming ring detected - used for auto-
answer application. DTE raised DTR to answer (optionally
DE-9 (EIA/TIA 574)
View of the female connector
Description
synchronized.
Ground
RS485 A)
Expects CTS from DCE.
RS485 B)
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