M20 Terminal
Version 8 dated 15.03.00 204
Siemens Information and Communication Products
A
4-pole Western plug (female)// handset
Fig. 9-3 Front view of Western plug 4-4 (male)
9-pole (female) SUB-D plug for V.24/V.28 serial interface, 1:1 cable connection (pin-to-pin) to a serial computer
interface
Note
:
The active logic level is +-5V
Detection of logic high level at U > 1,8V typ. (2,4V max.)
Detection of logic low level at U < 1,5V typ. (0,8V min.)
Pin Usage
1 Microphone (-)
2 Speaker (-)
3 Speaker (+)
4 Microphone (+), app. 5 V DC to pin 1 for supplying an electret microphone
Pin Comp.I/O Usage/computers point of view
1 I DCD In Data Carrier Detect
2 I RXD In Receive Data
3 O TXD Out Transmit Data
4 O DTR Out Data Terminal Ready
5 – GND – Ground
6 I DSR In Data Set Ready
7 O RTS Out Request To Send
8 I CTS In Clear To Send
9 I RI In Ring Indicator *
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