On 23.05.2017 03:41, Ethan Dicks via cctalk wrote:
No eye-rolling here. Nice find!
Here the same. Perhaps not the most wanted device - but... better have
than need...
I got home last night, and the unit fires up and works (well, in local mode.
Docs claim
it is rs232 out the back, but could not coax anything from my PC to it yet),
Do you have a "traffic light"? I find them invaluable for diagnosing
handshaking and TxD/RxD swaps.
The first thing I thought of. Everybody needs one. And 25/9-Adapters in
both directions, null modem cables and gender changers - then you get
everything running. Ok, add some sub d connectors to make weirdly wired
adapters if nothing helps.
Does your PC have real RS232? A lot of "RS232" ports are serial ports, but not
with correct
RS232 levels. If you have "TTL RS232" [sic] it won't work with an actual RS232
port.
I don't think that it's reasonable to check this problem first. Of
course, can happen. But more likely you have a null modem problem.
Keep in mind that "TXD" is the output of a DTE (Data Terminal
Equipment). TXD is therefore the input (!) of a DCE (Data Communication
Equipment aka modem).
PC RS-232 ports send on TXD because they consider themselves to be a
terminal. And a teletype IS actually a terminal. So you would need to at
least cross wires 2 and 3 (RXD/TXD) using a Null modem. If you want
hardware handshake, the same applies to DTR and CTS.
Good luck :-)
