PACKET RADIO: RS-232 Pinouts
(This text from the W8IZ packet radio bulletin
board. It's formatted to fit a 80 character screen.)
Common name RS232C Name Description
25pin 9 pin DCE Direction 1 AA x Protective Ground 2 TXD 3 BA I Transmitted Data 3 RXD 2 BB O Received Data 4 RTS 7 CA I Request to Send 5 CTS 8 CB O Clear to Send 6 DSR 6 CC O Data Set Ready 7 GND 5 AB x Signal Ground 8 CD 1 CF O Received Line Signal Detector 9 -- x Reserved for Data set Testing 10 -- x Ditto 11 x Unassigned 12 SCF O Secondary Received Line Signal Detector 13 SCB O Secondary Clear to send 14 SBA I Secondary Transmitted Data 15 DB O Transmission Signal Element Timing (DTE Source) 16 SBB O Secondary Received Data 17 DD O Receiver Signal Element Timing (DCE Source) 18 x Unassigned 19 SCA I Secondary Request to Send 20 DTR 4 CD I Data Terminal Ready 21 CG O Signal Quality Detector 22 9 CE O Ring Indicator 23 CH/CI I/O Data Signal Rate Selector (DTE/DCE Source) 24 DA I Transmit Signal Element Timing (DTE Source) 25 x Unassigned
How to wire a Nullmodem cable
25pin 9pin 9p 25p FG 1 - X - 1 FG TD 2 3 - 2 3 RD RD 3 2 - 3 2 TD RTS 4 7 - 8 5 CTS CTS 5 8 - 7 4 RTS SG 7 5 - 5 7 SG DSR 6 6 - 4 20 DTR DTR 20 4 - 6 6 DSR ---------------------------------------------------------------------------
Frame Ground Transmit Data Receive Data Request To Send Clear To Send Signal Ground Data Set Ready Data Terminal Ready
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