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7.2 20mA current loop inteiface
(l)
Specifilations
Signal polarity
Mark = logic I (Curent ON)
Space = logic 0 (Current OFF)
Other specifications are the same as those of RS232C.
(2) Connector
XMIT SOURCE
+XMIT DATA
-XMIT DATA (RTN)
XMIT SINK (GND)
- RECEIVE DATA (RTN
+RECEIVE DATA
RECEIVE SOURCE
-)C{IT DATA (RTN
+RECEIVE DATA
RECEIVE SINK (GND)
Pitl No.
Name of signal
Direction
Function
1
XMIT SINK
GND
l 0
+RECEIVE DATA
Positive received data
RECEIVED SINK
C N D
t'7
XMIT SOURCE
Transmitting power supply
I E
+XMIT DATA
Positive transmitted data
t 9
'XMIT DATA
Negative transmitted data (RTN)
2 l
- RECEIVED DATA
Negarive received data (RTN)
RECEIVE SOURCE
Receiving power supply
24
XMIT DATA
Negative transmitted data (RTN)
+RECEIVED DATA
Positive received data
- 3 5
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