RS-232 Signals and their functions
PIN
1 Frame Ground
2 Transmit Data, TD
3 Receive Data, RD
4 Request to Send, RTS
5 Clear to Send, CTS
6 Data Set Ready, DSR (The Portmaster does nothing on this signal)
7 Signal Ground, GND
8 Data Carrier Detect, DCD
20 Data Terminal Ready, DTR
22 Ring Indicator, RI
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