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6.4 Example of Connection to a Computer
When RS-232C is used:
IBM PC compatible
Communication control: XON/XOFF or CTS/DTR
“PC”
(DB25P)
Printer
(DB25P)
F.GND 1 1 F.GND
TXD 2 3 RXD
RXD 3 2 TXD
CTS 5 20 DTR (Ready/Busy)
S.GND 7 7 S.GND
DSR 6 4 RTS
DTR 20 5 CTS
“PC”
(DB9P)
Printer
(DB25P)
NC 1 F.GND
TXD 3 3 RXD
RXD 2 2 TXD
CTS 8 20 BUSY
S.GND 5 7 S.GND
DSR 6 4 RTS
DTR 4 5 CTS