Datecs EP-2000 Manual do Utilizador descarregar pdf (Página 3)

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EP_2000_PM_EN_V.1.60_Nov.2009.doc

Protocol mode

Protocol mode is active when the memory switch

. The purpose of this mode is

to give full control over the optional peripherals (MC and smart card reader) and a stronger

real time access to the printer. All input data are sent in packets as described below. The

printer returns an answer to the packet immediately.

Output packet

format:

Channel Command LenHi LenLo Data

Answer format:

Channel Status LenHi LenLo Data

Channel:

One byte:

Bits 0 – 6

Channel number (Device Type)

Bit 7

Send data;

Response

Command:

One byte with

possible

value:

Open channel

(No action – all channels always open)

Close channel

(No action – all channels always open)

Send data

Request data

> 4:

Application specific

Bit 0

No error Error occured

Bit 1

ACK

(Packet accepted)

NACK (Packet

not accepted)

Bit 2

Channel and

command OK

Wrong channel

or command

Bit 3

Battery OK Low battery

Бит 4

Printing head OK Printing head too

hot

Bit 5

Paper OK Out of paper

Bit 6

Not defined

Status:

One byte:

Bit 7

Printer ready Printer busy

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