TC65 Terminal Hardware Interface Description
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TC65 Terminal_HD_V02.000b Page 28 of 65 2007-02-19
3.6 RS-232 Interface
The serial interface of the TC65 Terminal is intended for the communication between the
GSM module and the host application. This RS-232 interface is a data and control interface
for transmitting data, AT commands and providing multiplexed channels. EMC immunity
complies with the vehicular environment requirements according to EN 301 489-7.
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Figure 6: Pin assignment RS-232 (D-Sub 9-pole female)
Table 10: 9-pole D-Sub (female) RS-232
Pin no. Signal name I/O Function of application
1 DCD O Data Carrier Detected
2 RXD O Receive Data
3 TXD I Transmit Data
4 DTR I Data Terminal Ready
Attention: Low-to-high transition of the DTR line activates the
ignition signal of the GSM module
5 GND - Ground
6 DSR O Data Set Ready
7 RTS I Request To Send
8 CTS O Clear To Send
9 RING O Ring Indication
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