January 2001/ version 1.4
WMOi3 Integrated Modem
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4.1.3 Serial link
A serial link interface is available complying with V24 protocol signalling but not
with V28 (electrical interface) due to a 2.8 Volts interface. TX, RTS and DTR can be
either 5V or 3V.
The signals are Tx data (CT103/TX), Rx data (CT104/RX), Request To Send
(CT105/RTS), Clear To Send (CT106/CTS), Data Terminal Ready (CT108-2/DTR)
and Data Set Ready (CT107/DSR).
The set of RS232 signals can be required for GSM DATA services application. The
2 additional signals are Data Carrier Detect (CT109/DCD) and Ring Indicator
(CT125/RI).
Table 7 : Serial Link pin description
Signal Pin number I/O I/O type* Description
CT103 / TX 25 I CMOS Transmit serial data
CT104 / RX 28 O 1X Receive serial data
CT105 / RTS 30 I CMOS Ready To Send
CT106 / CTS 13 O 1X Clear To Send
CT107 / DSR 27 O 1X Data Set Ready
CT108-2 / DTR 29 I CMOS Data Terminal Ready
CT109 / DCD 5 O CMOS / 2X Data Carrier Detect
CT125 / RI 9 O CMOS / 2X Ring Indicator
CT102/GND 21,24…** Ground
*See Table 3 “operating conditions” in subdivision 4.1.1The 50-pin
connector description
** Any of the available GND pins can be used
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