Epson Serial Interface GQ-3500 User Manual page 3

For RS422 operation, set the jumpers at Jl and J2 as follows. At Jl,
move REV, RD, and SRI to the right. At J2, set all jumpers in the
installed position, except for TR+ and TR-.
Jumpers that were not given a especific setting above do not need to
be changed to select RS-232C or RS-422 operation (although they
may affect how the interface works).
3.
Select a baud rate by setting DIP switches 4-1, 4-2, and 4-3 as
indicated in Table 2. (For more information on setting DIP
switches, see the Serial Interface DIP Switches section of this
chapter.)
4.
Select 7 or 8 data bits by setting DIP switch 4-4 on for 8 bits per
character or off for 7 bits per character. Using 8 bits per character
is usually best. If you selected 7 data bits, select even, odd, or no
parity and set DIP switches 4-5 and 4-6 appropriately.
5. Select a handshaking protocol. If you are using a commercial
software program, look in the manual to see if it requires a
particular protocol. If not, try the printer ready protocol. Set DIP
switches 5-l through 5-4 appropriately. Note that you can use
more than one protocol at the same time. For additional
information, see the Communications Protocols section.
6.
Customize the interface if you need more control of the serial
interface. Study the functions shown in Table 3 that describe the
jumpers. For example,' it's possible to add DSR, CIS, and DCD
control to the interface.
Installing the Interface
Installing the serial interface is easy and doesn't require any tools.
Just follow these steps:
1. Make sum that the power to the printer is off.
2 Set the DIP switches on the interface card as described in
Appendix C. Use a ballpoint pen or similar object to set the
Switches
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Serial Interface