M20 Terminal
Version 8 dated 15.03.00
204
Siemens Information and Communication Products
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 *