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Can’t get serial port to work
Posted: Tue May 09, 2023 4:18 am
by okto
I wired up an adapter cable for RS232 and I can’t get it to pass data no matter what I try. I’ve triple-checked the pinout, I’ve tried it with every combination of cables I have, both null-modem and straight through, and I cannot get it to talk to my Mac. Tested it with both my Z88s, no dice on either one.
I’m using a Keyspan USB serial adapter that works fine with all my other old computers. Same adapter, same software, settings match on the terminal app and the Z88.
I’m at a loss. What am I doing wrong?
Re: Can’t get serial port to work
Posted: Tue May 09, 2023 10:59 am
by Chris_68
Hi,
Did you connect following the instruction here:
https://cambridgez88.jira.com/wiki/spac ... rial+Cable
?
Are you sure the serial port on z88 is working correctly?
/C
Re: Can’t get serial port to work
Posted: Fri May 12, 2023 1:57 am
by Jbizzel
This is the adapter you need. I have a spare if needed.
Code: Select all
z88 pc
1--+
2-------2 |
3-------3 |
4-------8 |
5-------7 |
|
7-------5 |
8--+ |
| |
9--+----6--+
Re: Can’t get serial port to work
Posted: Fri May 12, 2023 3:44 am
by okto
Turns out I just don’t understand how RS232 works and I didn’t cross DTR/DSR or RTS/CTS. Got it working now.
Thanks for the links, y’all.
Re: Can’t get serial port to work
Posted: Fri May 12, 2023 6:35 am
by Chris_68
Hi,
Great, glad you sorted it.
Re: Can’t get serial port to work
Posted: Sun May 14, 2023 7:27 pm
by okto
Jbizzel wrote: ↑Fri May 12, 2023 1:57 am
This is the adapter you need. I have a spare if needed.
My cable doesn't have Z88 pin 8 or 9 tied together, but seems to work fine.