jbert:

I totally agree with you--you should use flow control whenever possible. Unfortunately, it's not always possible. In order to implement flow control, all devices in the chain must support it. It's not uncommon in the embedded world to connect with things that have no flow control. You may just have minimum/maximum timings on a specification sheet.

For example, let's suppose that the modem on the SMS system, once it gets the proper "doit" string from the originator triggers a relay that connects the modem to a transmitter. That relay could take a few milliseconds to engage, and you could easily lose the first character or two while the relay is actuating.

--roboticus

In reply to Re^2: Lost characters using Device::Modem by roboticus
in thread Lost characters using Device::Modem by shigetsu

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