Service manual

09/09 Rev. 5.02-02 SERVICE MANUAL Service Electronics

AP 4.4 – AP 5.4 – AP 7.t

Application

The I/O board may be used for 3 different applications:

• 2

RS 232 interface:

The I/O board provides a RS 232 interface, which can be applied additionally

to the one on the CPU board. The 2

interface can e.g. be used to connect

a bar code scanner.

• RS422/485 interface:

If there is a long distance between host and printer, RS 485 or RS 422 is

sometimes used instead of RS 232 or Centronics. This is often realized in in-

dustrial plants, where galvanic isolation is required to avoid ground loops.

• Signal interface:

If an applicator is applied with the printer, this requires the exchange of con-

trol signals between printer and applicator. Therefore, signals like „printing is

finished“ have to be generated by the printer and the printer itself must wait

for a signal like „start print“ from the applicator, before it starts printing the

next label. Galvanic isolation is provided for robustness. The output signals

can also be used to drive signal lamps.

¯ The two serial interface types cannot be used at the same time.

¯ Signal interface and serial interface can be used at the same time. The

signals of both interfaces must then be related to the same supply system

(same ground potential).