Subj : USR 5686 no reply at AT command
To   : All
From : rmurray
Date : Wed Aug 21 2024 11:02 pm

Hello,

I recently received my first two US Robotics modems for my Mystic BBS. Unfortunately, the first one was defective, but the seller refunded me.

The second modem is brand new, yet neither of them responds to AT commands. However, the new one does dial out and can synchronize with a BBS. The issue is that it doesn't respond to any AT commands sent to it. This is causing a significant problem with Windows because, without proper responses to AT commands like "OK" or "ERROR," Windows fails to recognize the modem. This also affects SEXYZ, as it expects the modem to acknowledge its commands.

I suspect there's something I'm missing or haven't done correctly. These are US Robotics 5686 modems, which are standard serial modems. I've tested them on several serial ports across multiple computers, including the built-in ports on the motherboard and special RS232 serial cards.

Does anyone know how to resolve this issue?

                VA2RFC BBS    Les M‚chins, Qu‚bec  Canada
               SysOp: rmurray    PhoneNet: 1000040 (Modem)
  Telnet: va2rfcbbs.photorm.net:23    FsxNet: 21:1/235    FidoNet: 1:229/114

--- Mystic BBS v1.12 A48 (Windows/64)
 * Origin: VA2RFC BBS (21:1/235)

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