Citizen CL-S700R ユーザーズマニュアル

 2-54 

 

 

Transmission system 8-bit parallel data 
Receive buffer size 

16K bytes 

Transmission modes

Compatible mode 
It is an asynchronous forward channel mode to send the byte width 
data from the host to the printer. The interface line of the data is 
operated in accordance with signal line definitions of Centronics. 
NIBBLE mode 
It is an asynchronous reverse channel mode to send the data from 
the printer to the host. In Nibble mode, 4-bit data (half byte) is sent at 
a time using the 4 status lines (FAULT, SELECT, PE, and BUSY). To 
send one complete byte data, the printer sends 2 nibbles (8 bits in 
total) to the host. Nibble mode is usually combined with Compatible 
mode to create a complete bi-directional channel. 
ECP mode 
ECP mode permits bi-directional asynchronous data transmission, 
and by means of interlock handshake, it does not require the timing 
necessary with Compatible mode. 

Signal level 

IEEE1284 compatible 

  

 

Pin No.  Signal name 

I/O 

Function in Compatible Mode 

1 

STROBE 

Input 

Strobe signal to read in 8-bit data 

2-9 

DATA0-7 

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 end 

13 

SELECT 

Output  Signal specifying if the printer is on-line (printing enabled) 

or off-line 

14 AUTOFD 

Input Invalid 

(ignored) 

15 NC 

---  Not 

used 

16 SGND 

---  Signal 

ground 

17 FGND 

---  Frame 

ground 

18 

P.L.H 

Output  Peripheral logic high (pulled up to +5V at 1KΩ) 

19-30  GND 

--- 

Ground for twisted pair return 

31 PRIME 

Input Printer 

reset 

32 

FAULT 

Output  Signal specifying printer error 

33 GND 

---  Signal 

ground 

34 NC 

---  Not 

used 

35 FUSE 

---  Not 

used 

36 SELECTIN  Input Invalid 

(ignored)