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Why does RapidPort fail where DigiRAS does not?

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We produce time & attendance software. My area of concern is using modems to communicate with embedded-system time clocks. We have been communicating with 2400 & 19200 bps time clocks for years with our software using multiport DigiRAS products. When we switched to a USB Digi Rapidport, communications to the 19200 bps devices are working fine, but when dialing out to 2400 bps device, it comes back with "NO CARRIER" after about 4 seconds. Both are using the same phone lines (manually switched between DigiRAS & Rapidport as needed). The initialization string in use is "AT&F0E0W2" on RapidPort. The result code using "AT#UD" is 50, "AnyKeyAbort". This is a software application, so there is no character output after the dial command for at least 60 seconds. I think our software can be ruled out, as the same software works fine with DigiRAS, with a different initialization string, of course.
What can I try? This error makes no sense.
asked Aug 4, 2014 in USB Serial by gmorris New to the Community (0 points)

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1 Answer

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Rapid port and DigiRAS are very different products under the covers. I'm guessing it might be with the way they handle the serial ports.

You could try a port monitor trace between them and find the differances:
http://www.digi.com/support/kbase/kbaseresultdetl?id=456
answered Aug 4, 2014 by kjensen8 Veteran of the Digi Community (653 points)
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