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Three Epson serial interfaces are suitable for LQ printers. All three
offer a choice of 7-bit or g-bit data, and support Current Loop operation
in addition to RS-232C. They also offer a choice of other features, which
are listed in Table F-2.
Table F-2. Send interface
X-on/X-off control
Self test
Built-In data buffer
#a143
#al45
yes
no
no
loopback
none 2K
#al48
yes
loopbackl
line monitor
218K
X-on/X-off protocol is a system in which the printer transmits a code
to the computer to indicate that it cannot accept more data, and a
second code when it is once more ready
The loopback self-test mode allows direct testing of the functions of
the interface without connecting a computer; line monitor mode is
rather like the LQ data dump mode.
Identifying a serial interface board
All Epson interfaces have the EPSON name printed on them. If the
board has an identification code printed on it, it will be a four digit
number beginning with an eight. The number should be one of the
numbers in Table F-3.
If the board has no identification code, or if you are unsure whether
the number you have located is the correct code, check the number of
DIP switches on the board against Table F-3.
Table F-3. Number of DIP switches
Choosing and Setting Up Optional Interfaces
F-3