Citizen CL-E700 Series User Manual page 85

Appendixes
Interfaces
Parallel Interface (Option)
Specifications
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
Signal line and pin assignment table
Pin No. Signal name
1 *STROBE
2-9 DATA1-8
10 *ACKNLG
11 BUSY
12 PERROR
13 SELECT
14 *AUTOFD
15 NC
16 GND
17 FGND
18 P.L.H
19-30 GND
31 *INIT
32 *FAULT
33-35 NC
*SELECTIN
36
85
I/O Function
Input Strobe signal to read in 8-bit data
Input 8-bit parallel signal
Output 8-bit data request signal
Output Signal specifying printer busy
Output Signal specifying media out
Output Signal specifying if the printer is on-line
(printing enabled) or off-line (pausing)
Input Invalid (ignored)
- Not used
- Signal ground
- Frame ground
Output Peripheral logic high (pull up to +5 V at
1.2 kΩ)
- Ground for twisted pair return
Input Printer reset
Output Signal specifying printer error
- Not used
Input Invalid (ignored)