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Interface description – Siemens TC35 User Manual

Page 26

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24

Interface description

Purpose of the connectors/connections

Use and operation
In order to control the Terminal and transfer
data, the customer application (e.g. host
computer) is connected via the RS232 cable.

Signal
name

PIN I/O

Description

Parameters

DCD

1

O

The functions
correspond to those
of a serial interface
on the basis of a
V.24 protocol.

active high >5V
low <–5V

RXD

2

O

logical 1=low <–5V
logical 0=high >+5V

TXD

3

I

active high >2.4V
low <1.8V

DTR

4

I

active high >2.4V
low <1.8V

GND

5

0 V

DSR

6

O

active high >5V
low <–5V

RTS

7

I

active high >2.4V
low <1.8V

CTS

8

O

active high >5V
low <–5V

RI

9

O

active high >5V
low <–5V