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Serial port
Printers on the serial port
Hardware connection
You should check carefully what options for flow control your printer uses, and if
possible set it to XOFF/XON flow control. Some printers have alternative flow
control mechanisms involving ETX/ACK (different control characters from
XOFF/XON, transmitted under slightly different circumstances), or RTS/CTS (
signals on additional wires on the interface cable).
An example
The diagram (right) shows the serial port signals
used to connect to an Apple LaserWriter laser
printer:
Software connection
For information on how to set up the software
side of things, see Printing on page 55. You'll
also find more information in Printing in the RISC
OS 3 User and Applications Guide.
Modems on the serial port
A modem is usually connected up differently from a printer. This is because a modem
is a DCE device; printers are DTE devices. The main difference is that the connections
are 'straight through' — the modem expects to receive data on the 'transmitted data' line,
and vice versa, whereas when connecting terminal to computer or computer to
computer the connections have to be crossed over.
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