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Saia-Burgess Controls AG
Manual
Manual PCD 1 / PCD 2 Series
│ Document 26
/
737 E
N22 │ 2013-11-26
Appendix
A-4
Definitions of serial interfaces
A
A.2.3
TTY / current loop
Signals to TTY / current loop
Terminal 11
TS
Transmitter Source
Transmitter
Terminal 13
TA
Transmitter Anode
Terminal 16
TC
Transmitter Cathode
Terminal 18
TG
Transmitter Ground
Terminal 12
RS
Receiver Source
Receiver
Terminal 14
RA
Receiver Anode
Terminal 17
RC
Receiver Cathode
Terminal 19
RG
Receiver Ground
Signal type
Required value
Nominal value
Power for logic L (space)
-20 mA to + 2 mA
0 mA
Power for logic H (mark)
+12 mA to +24 mA
+20 mA
Neutral voltage to TS, RS
+16 V to +24 V
+24 V
Short circuit power on TS, RS
+18 mA to +29.6 mA
+23.2 mA
The idle state of the data signals = “mark”
By wiring to the cable connector, the user selects either an “active” or “passive” cir-
cuit.
The max. transmission rate for 20 mA TTY / current loops is 9600 bps.