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