Citizen Systems cl-s700r Benutzerhandbuch

72

Transmission mode

8-bit parallel data

Receive buffer size

16K bytes

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

Pin No. Signal name

I/O

Function

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 +5V at 1k

Ω)

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)