Epson GQ-3500 Manual del usuario - Página 10

Navegue en línea o descargue pdf Manual del usuario para Accesorios para impresoras Epson GQ-3500. Epson GQ-3500 13 páginas. Product support bulletin(s)
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The GQ-3500 has a buffer that will hold up to 102 characters,

including the ETX code at the end of the group. The computer can

send the first group of characters and then stop until the first ACK is

received. From then on,every time an ACK is received, another

group of characters can be sent.

DlP switch 5-2 controls ETX/ACK protocol. If DIP switch 5-2

iS Off, the GQ-35OO is ignored the ETX code.

The DCl/DC3 or XON/XOFF protocol

The DC1/DC3 protocol also uses a special pair of control codes,

DCl (AscII 17 decimal, also knwon as XON) and DC3 ( ASCII 19)

decimal, also known as XOFF) This communications protocol is

selected by turning DIP switch 5-1 on.

In this protocol the printer sends a DC3 to the computer to suspend

data entry under the following conditions

1. when the input buffer becomes nearly full (within 128 bytes)

2 When the printer goes offline (by pressing the ONLlNE button)

When the printer runs out of paper

When the printer runs out of toner

5. When an errror is detected.

when the computer receives the DC3 signal it must stop within

128 characters) sending information until the printer sends a DCl signal

to say that there is more room in the buffer. The printer sends the DCl

signal when the buffer has room for 255 characters

If DIP switch 5-4 is on, the printer will send an additional DC3

after each additional character it receives after it sends the first DC3.

This is called the multiple XOFF function.

The printer ready protocol

The printer ready protocol is a hardware protocol because it uses

one of the wires in cable connecting the computer and printer to tell

the computer where , the printer is ready to accept information. This

communications potocol is selected by turning DIP switch 5-3 on.

serial Interface