Make Serial Cable Myself
Make Serial Cable Myself
I have to debug into the firmware on a embedded x86 system, which need a serial cable. However, I can not found my cable after we moved to new office, thus I have to make one since hardware engineer is in vacation. Although I did that several years ago, I googled on how to connect the wires. Just keep it as archive:
5 1--------------------------------
_____________
\ . . . . . /
\ . . . . /
\-------/ [This diagram show a female connector.]
9 6
Pin Signal Description
--------------------------------
1 DCD Carrier Detect
2 RxD Receive Data
3 TxD Transmit Data
4 DTR Data Terminal Ready
5 GND Signal Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
--------------------------------
To connect two 9-pin D-sub connectors for serial communication between two PC, follow the fowling scheme, and leave the other pins unconnected.
2⊙←→⊙3
3⊙←→⊙2
5⊙←→⊙5
By the way, serial port could be a 25-pin D-Sub connector. To connect a 9-pin with a 25-pin:
Port A(9-pin） Port B(25-pin)
2⊙←→⊙3
3⊙←→⊙2
5⊙←→⊙7
At last, to connect 25-pin with 25-pin ports:
2⊙←→⊙3
3⊙←→⊙2
7⊙←→⊙7
posted 2004.06.21 Monday
分类
Technology
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