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18. CIRCUITS
Official name
Signal Ground
Transmitted Data
Received Data
Request To Send
Ready For Sending
Data Set Ready
Data Terminal Ready
Received Line Signal
Detector
Calling Indicator
Abbreviation Circuit number
GND
Circuit 102
TxD
Circuit 103
RxD
Circuit 104
RTS
Circuit 105
CTS
Circuit 106
DSR
Circuit 107
DTR
Circuit 108/2
RLSD
Circuit 109
CI
Circuit 125
Unofficial name
Data Carrier Detect (DCD)
Ring Indicator (RI)
107/113
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