Owner`s manual

33
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The Model 24 will allow pairs of serial computers (or computers and
other devices such as modems, scales, data collection equipment, etc.)
to communicate while other computers are sending print jobs to the
unit. Full duplex communication allows file transfer with many popular
communications software packages.
NOTE: Computer-to-computer communication can occur only if both
ports communicating are serial. Parallel ports allow one-way
communication only and will not provide full duplex communication.
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If two serial computers wish to communicate, either computer must
send the Port Select Code followed by the desired computer port
number and a terminating character: Enter/Return or Line Feed . If the
requested computer is free, the two computers are connected with full
duplex communication and an On Line message is sent by the Model
24 to the computer requesting the connection. If the requested
computer is busy, the computer requesting connection receives a Busy
message from the unit.
In order to terminate a connection between two computers, either
computer must first delay two seconds and then send the Port Select
Code followed by a terminating character: Enter/Return or Line Feed .
If there is not a two second delay prior to sending the disconnect
sequence, the entire disconnect sequence will become invalid and
passed through to the other connected computer device.
The Model 24 will respond to a valid disconnect sequence by sending
an Off Line message to the device requesting the disconnect.