This has been cross-posted to "ooRexxUsers" and "ooRexx-devel"
==============================================================
I am now a volunteer and am associated with a County Emergency
Operations Center, and I need to put some "very old" radio
equipment back into service...
...some of which likes to communicate with a computer via an RS-232
connection. Since most modern computers do not have RS-232 ports
anymore, I have purchased an RS-232 USB adapter cable.
I am finding that my knowledge on how to use ooRexx to communicate
with an RS-232 port is VERY limited...
...and I am having problems making it work.
1. I will be using this equipment with Windows 10 and with Linux.
My primary test environment is Linux: Ubuntu 14.04 with Cinammon
(Don't like UNITY!)
2. ooRexx 4.2 on all systems.
3. The USB cable shows up as /dev/ttyUSB0 under Linux
and as COM1 under windows.
4. The external equipment works in a half-duplex mode.
You send it a command and it responds with an answer.
The "commands" are formatted in a manner very similiar to
the old Hayes modem commands, I.E.
"AT" followed by a command text followed by a carriage return
(all upper case!)
I know that the hardware works, since I can use "minicom" on Linux
to communicate with the external device, which only supports
300 or 1200 baud, 8-bits no-parity or 7-bits even/odd parity.
Questions:
1. Is there a way to specify port speed, parity, etc. from INSIDE
the ooRexx routine?
Under Linux, I can use "stty" externally, but can not invoke it
internally from the ooRexx routine because the change is not
maintained for the remainder of the duration of the rexx exec.
(apparently this is an Enviromental/Shell issue... ???)
2. More importantly, does anybody have a simple read/write ooRexx
sample that can talk to a com port? (I beleive that stream IO
and charin/charout are required. Lineout doesn't seem to
transmit anything, but charout does.)
I can get my routine to transmit, but I do not seem to be able
to receive any data.
Normal use: I send a command like "ATRT" <CR>, and it responds
with a 6-digit message and a <CR> or <CRLF>.
3. I know that data is being transmited, because I can see the
"flashing lights" on my rs-232 test adapter. I think, however,
that the speed or parity might be wrong, as the remote device
does not seem to be responding.
As I said, the remote device uses commands that start with "AT"
like those used in the old Hayes modems, and it will respond
with either a "0" <CR> or possibly a 4 to 8 character message and
a <CR> when it recognizes a command request.
4. any help would be appreciated.
/s/ Bill Turner, wb4alm
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