david@wubios.wustl.edu (David J. Camp) (09/29/89)
This is to reveal the successful configuration of the Practical Peripherals MNP modems mentioned in two previous notes. Finally I called the Technical Support at PP, and with a small adjustment in the configuration, I was able to get the modem to work properly at no parity. The problem is a bug in the proms in that particular model, and PP has promised to send me an upgrade in the mail. They said I was the first customer they were able to promise this to. The temporary workaround was to set AT&D2 instead of AT&D3. The problem is there is a bug in which the stored value for the parity is invalid. Even when you use AT&W and AT&V and the modem says it has stored 8N, it is really storing 7E. The current value in use may actually be 8N, but if the modem power is cycled or the ATZ command is issued, or DTR drops with AT&D3 asserted, then the hidden value of 7E will be restored to the current registers. Now that I am using AT&D2, and explicitly setting the parity to none after power-on, my modem is working properly in reliability and compression mode with no parity. -David- -- Bitnet: david@wubios.wustl ^ Mr. David J. Camp Internet: david%wubios@wucs1.wustl.edu < * > Box 8067, Biostatistics uucp: uunet!wucs1!wubios!david v 660 South Euclid Washington University (314) 36-23635 Saint Louis, MO 63110