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Interface Connector
Serial Interface
Pin No. Signal name
Direction
Function
1 FG - Frame Ground
2 TxD Output Transmit Data
3 RxD Input Receive Data
4 RTS Output Request To Send
6 DSR Input Data Set Ready
7 SG - Signal Ground
20 DTR Output Data Terminal Ready
Serial Interface Connection(Example)
Host(DTE ex 8251) Printer
TXD RXD
DSR DTR
RXD TXD
DTR DSR
S.G S.G
Parallel Interface Connector Pin Assignment