You just open the serial port and issue Hayes AT commands as text over the serial port.

ATH (hook command)

ATDT +123456789 (dial command)

Etc...

https://en.wikipedia.org/wiki/Hayes_AT_command_set



On 12/5/2025 1:23 PM, Peter Vollan wrote:
I am still perplexed about how to write a program that pickes up the modem, calls the number, captures the result, and hangs up. With my NIST program I used LINEINPUT looking for a "*" terminating the line.

On Fri, 5 Dec 2025 at 08:36, Gregory McGill <[email protected]> wrote:

    any m100 terminal prg works with external hayes..  what are you
    exactly asking for?


    On Thu, Dec 4, 2025 at 6:23 PM Peter Vollan <[email protected]>
    wrote:

        Program(s) for model 100 that use an external Hayes modem?

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