Hardware Manual PCD1.M2110R1 │ Document 27-619 │ Version ENG 04 │ 2018-08-20
Saia-Burgess Controls AG
Definition of Serial Interfaces
Annex
A-2
A
A.2
Definition of Serial Interfaces
A.2.1
RS-232
Designation of signal lines:
Data lines
TXD
Transmit data
[Transmit data]
RXD Receive data
[Receive data]
Signal and response
circuits
RTS
Request to send
[Transmit part switched on]
CTS
Clear to send
[Readiness to send]
DTR
Data terminal ready
[Terminal ready]
DSR Data set ready
[Ready for use]
RI
Ring indicator
[Incoming call]
DCD Data carrier detect
[Partner ready]
Signals to RS-232
Signal type
Logic status
Setting
Setpoint value
Data signal
0 (empty)
1 (character)
+3 V to +15 V
-15 V to -3 V
+7 V
-7 V
Control/message signal
0 (off)
1 (on)
-15 V to -3 V
+3 V to +15 V
-7 V
+7 V