RS232 Cable.txt
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RS232 Cable
text included from RS232 Cable.txt on Hitmen Website.
Please check the text for credits!
1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 5 o o o o o o o o o o o o o o o o o o 25pin sub-d 9pin sub-d o o o o o o o o o o o o o o o o 14 15 16 17 18 19 20 21 22 23 24 25 6 7 8 9 (pinout shown looking from soldering side) pin pin sig signal name purpose 25p. 9p. 2 3 TXD Transmit Data outgoing data bits 3 2 RXD Receive Data incoming data bits 4 7 RTS Request to Send incoming handshake 5 8 CTS Clear to Send outgoing handshake (remote RTS) 6 6 DSR Data Set Ready (remote DTR) 8 1 CD Carrier Detect (remote carrier) 20 4 DTR Data Terminal Ready terminal ready status 7 5 GND System Ground signal ground 1 na FG Frame Ground signal shielding note: FG should be connected only on one end of the cable! wiring for NULLMODEM (DTE <=> DTE, ie 2 Computers): --------------------------------------------------- variation1: ("3-wire", no handshake) RXD ----- TXD TXD ----- RXD GND ----- GND FG ---( FG this is not sufficient for most applications. if you really think this is what you want to use, you probably know what you are doing. variation2: ("5-wire", hardware handshake) RXD ----- TXD TXD ----- RXD RTS ----- CTS CTS ----- RTS GND ----- GND FG ---( FG this works stable for simple applications, use this for prototyping and alike :) variation3: ("full", hardware handshake, status) RXD ----- TXD TXD ----- RXD RTS ----- CTS CTS ----- RTS DTR ----- DSR DSR ----- DTR GND ----- GND FG ---( FG full "modem" status, except CD. not practical. (may not work for programs that expect a modem, ie terminal-programs) variation4: ("full local", hardware handshake, local status) RXD ----- TXD TXD ----- RXD RTS ----- CTS CTS ----- RTS DTR ---+- DSR +- CD DSR -+ CD -+--- DTR GND ----- GND FG ---( FG note: DSR + CD are bridged to fool programs to think that they are online. this is the suggested cable for endusers, it should work for any program written for rs232 communications.