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Saia-Burgess Controls AG
Hardware manual for PCD3 series │ Document 26-789 ENG19│ 2018-06-29
Appendix
A
A-3
Definitions for the serial interfaces
A.2
Definitions for the serial interfaces
A.2.1 RS-232
Designation of the signal lines
Data lines
TXD
Transmit data
Send data
RXD Receive data
Receive data
Signal and message
lines
RTS
Request to send
Activate transmitter
CTS
Clear to send
Ready to send
DTR
Data terminal ready
Terminal ready
DSR Data set ready
Ready
RI
Ring indicator
Incoming call
DCD Data carrier detect
Partner ready
Signals to RS-232
Signal type
Logical status
Setpoint value
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
- control and message signals = off