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.
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.
DE-9 (EIA/TIA 574)
looking into female connector
6.2.5 D-Sub HD 15-pin connector
RB800 can be equipped with DE9 15-pin connector to control RS232 interface and
GPIO lines. GPIO lines can be controlled by internal Python application, see Python
Script Interpreter and AT Reference manual for details. Below you can find pins
description of this variant of modem.
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