Appendix A System Interface Description

Additional Information

After Power-ON DTR and RTS are activated and the printer is ready to receive data.

XOFF is sent, when the interface buffer has only space left for 256 more charac- ters. XOFF is sent again, at a level of 128 characters buffer space. Further incoming data will be stored until the interface buffer is full. All data sent in addition will get lost.

XON is sent when the interface buffer provides space for a minimum of 512 characters.

XON/XOFF can only be sent successfully when CTS and (DSR) is at active state.

XOFF will be sent immediately if local mode is entered.

XON is sent again, if local mode is left and a minimum of 512 byte interface buffer is available.

Appendix A System Interface Description

3 Parallel Centronics® Interface

Interface Characteristics - Connector pin assignment / signal definition

 

 

 

 

 

 

 

 

 

 

 

Pin No.

Return

Direction

 

 

 

Signal Description

 

line Pin

 

 

 

 

 

 

No.

 

 

_______

*)

Control Signal from the Host.

1

19

Input

 

STROBE

Printer reads data line (Data 1 to Data 8) when

 

 

 

 

 

 

going low.

 

 

 

 

Data 1 - 8

 

Data lines transfer the characters from the host to

2 - 9

20 - 27

Input

 

 

 

the printer. Data 8 = most significant bit.

 

 

 

 

_____

 

Acknowledge - Control signal from the printer. Logi-

10

28

Output

 

ACKN

*)

cal 0 indicates that the printer has received a print/-

 

 

 

 

 

 

control character and is ready for the next data

 

 

 

 

 

 

transfer.

 

 

 

 

BUSY

 

Control signal from the printer. Logical 1 indicates

11

29

Output

 

 

 

that the printer is unable to receive any more

 

 

 

 

 

 

data.**)

 

 

 

 

PE

 

Paper Empty - Control signal from the printer. This

12

--

Output

 

 

 

signal goes high when paper runs out, i.e. load

 

 

 

 

 

 

upper or lower tractor, paper jam.

 

 

 

 

SELECT

 

Control signal from the printer. Always logical 1.

13

--

Output

 

 

 

Indicates that the printer is ON-LINEand ready.

 

 

 

 

LG

 

Logic Ground

14

--

 

 

--

 

not used

15

--

 

 

LG

 

Logic Ground

16

--

 

 

CG

 

Chassis Ground

17

--

 

 

VCC

 

+ 5 volt

18

--

 

 

SG

 

Signal Ground

19 - 30

--

 

 

____

*)

Control signal from the host. Does not reset the

31

--

Input

 

INIT

printer but generates an acknowledge pulse (logical

 

 

 

 

 

 

1).

 

 

 

 

______

 

Control signal from the printer. Always logical 1. If it

32

--

Output

 

FAULT

*)

goes to logical 0 the printer has been switched off.

 

 

 

 

LG

 

Logic Ground

33

--

 

 

--

 

not used

34 - 36

--

 

 

 

 

 

 

 

 

*) Overlined signal names indicate that the signal is true when the signal level is low.

**) When the interface buffer is full except for the last character, BUSY will not be reset. BUSY will be reset when space is available again for least 256 charac- ters in the interface buffer. While the printer is offline (Stop Mode) BUSY remains active until the printer enters the online state again.

A-7A-8

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Image 65
Epson MTX 1345 manual Vcc
Page 64 Page 66

MTX 1345 specifications

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