In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

http://bray.velenje.cx/avr/terminal

This site provides Terminal v1.92 for free [maybe].  I am having trouble connecting and they may have gone to shareware.

Hyperterminal is mentioned in another thread as supporting a limited ASCII from 0-127 and only the visual characters.  Terminal will also handle everything in HEX and can operated with odd serial formats [like 12 bits].  XON/XOFF and other handshaking has indication of on or off condition.

Essentially RS-232 and RS-485/422 is about the driver chips.  RS-422 in particular is set up to mimic RS-232 transparently in a full duplex mode, but has 2 separate twisted pairs [one for Rx and one for Tx].

This is a simple node-to-node communication set up.  Since you have 3 nodes, you need to clarify their relationships to eachother.  Seems one should be the master and the other two slaves of some sort.  The master could enable one by broadcasting an address with an enabling code [this would not be in the SX, but in the master] or you might have to have handshaking controls via wire.

Definitely need more info.

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