Citizen CL-E700 Series ユーザーズマニュアル

85

Transmission mode

8-bit parallel data

Receive buffer size

16kB

Transmission modes

Compatible mode:
It is an asynchronous forward direction of the byte 
width (from host to printer) channel, and the interface 
line of the data is operated in accordance with signal 
line definitions of Centronics.
NIBBLE mode:
Nibble mode is asynchronous reverse channel 
communication with data transmission controlled by 
the host computer. In reverse channel transmission, the 
data is nibble transmitted in two parts using four status 
lines (Fault, Select, PE, and Busy). And nibble mode can 
be used along with compatible mode to send data in 
two directions.
ECP mode:
ECP mode permits bi-directional asynchronous data 
transmission, and thanks to its interlock handshake, it 
does not require the timing necessary with compatible 
mode.

Signal level

IEEE1284 standard

1

*STROBE

Input

Strobe signal to read in 8-bit data

2-9

DATA1-8

Input

8-bit parallel signal

10

*ACKNLG

Output

8-bit data request signal

11

BUSY

Output

Signal specifying printer busy

12

PERROR

Output

Signal specifying media out

13

SELECT

Output

Signal specifying if the printer is on-line 
(printing enabled) or off-line (pausing)

14

*AUTOFD

Input

Invalid (ignored)

15

NC

-

Not used

16

GND

-

Signal ground

17

FGND

-

Frame ground

18

P.L.H

Output

Peripheral logic high (pull up to +5 V at 
1.2 kΩ)

19-30

GND

-

Ground for twisted pair return

31

*INIT

Input

Printer reset

32

*FAULT

Output

Signal specifying printer error

33-35

NC

-

Not used

36

*SELECTIN

Input

Invalid (ignored)