B.3 Serial Printers and other devices

Other serial devices may be smart (like modems) or dumb. Modem control commands may be ignored by some devices, but misinterpreted by others. For example, a non-Plug and Play serial printer would likely print out an "AT<tell_me_your_ID> command on a fresh page, which would annoy the user while failing to elicit a Plug and Play ID.

Serial printers are usually configured to a fixed serial port rate of 9600 bit/s or faster. They do not Autobaud.