Re: [hylafax-users] MultiTech MT5634ZBA V92

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

GianLuca Sarto wrote:
> I have connected two MT5634ZBA V92 modems from MultiTech and 
> experience occasional errors that LOCK up the COM port with TR=on, and 
> oblige me to power off the server AND disconnect the plug in order to 
> regain control of the COM port.

It seems odd that you can't just power cycle the modem to "unwedge" the 
modem.

As far as *why* the modem is wedging, that is something that Multitech 
would need to address with you.  However, it has recently come to my 
attention that using:

ModemSoftResetCmd: AT
ModemOnHookCmd: AT


In your modem config file *may* alleviate the problem.  Apparently the 
claim is that something in the on-hook (ATH0) or soft-reset (ATZ) 
processes run by the modem can trigger the wedging in some 
circumstances.  Avoiding those processes altogether seems to avoid the 
wedging.

Since HylaFAX uses on-hook, soft-reset, and DTR drop all combined it is 
usually okay to do this.  The DTR drop will both reset the modem *and* 
put the modem on hook as well.  So ATH0 and ATZ are superfluous in those 
cases.

Lee.


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