Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Definitions of serial interfaces
Annex
A-2
A
A.2
Definitions of serial interfaces
A.2.1 RS-232
Designation of signal lines:
Data lines
TXD
Transmit data
RXD
Receive data
Signal and
response circuits
RTS Request to send
CTS Clear to send
DTR Data terminal ready
DSR Data set ready
RI
Ring indicator
DCD Data carrier detect
Signals to RS-232
Signal type
Logical state
Set-point
Nominal value
Data signal
0 (space)
1(mark)
+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
The idle state
of the data signals = "mark"
of the control and message signals = “off”