Installing the interface – Epson Serial Interface GQ-3500 User Manual

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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).

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.)

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.

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.

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

Serial Interface