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.

2Set the DIP switches on the interface card as described in Appendix C. Use a ballpoint pen or similar object to set the

Switches

 

 

 

I 2

Serial Interface