Siemens TC35 - Manual (Page 26)

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