10 Instrument setup
Roche Diagnostics
COBAS INTEGRA 400 plus analyzer/Cedex Bio HT Analyzer · Software version 3.6/5.1 · Host Interface Manual · Version 1.24
196
About the RS-232 serial interface
Signal description
The following table shows the most commonly used
signals.
There are about 25 different signals defined in the
standard of CCITT V.24.
Normally only some of these are used.
CCIT
EIA
Signal
name
Description
9 pin
connector
25 pin
connector
101
AA
PG
Protective ground
1
102
AB
SG
Signal ground or common return
5
7
103
BA
TxD
Transmitted data
3
2
104
BB
RxD
Received data
2
3
105
CA
TRS
Request to send
7
4
106
CB
CTS
Ready for sending (clear to send)
8
5
107
CC
DSR
Data set ready
6
6
108/2
CD
DTR
Data terminal ready
4
20
109
CF
DCD
Receive line signal detector
1
8
y
Signal assignment