Citizen CL-S400DT User Manual page 60

Appendixes
Interfaces
Parallel Interface (Option)
Specifications
Transmission mode 8-bit parallel data
Receive buffer size 16 kB
Compatible mode:
Transmission modes
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 Input
2-9 DATA1-8 Input
10 *ACKNLG Output
11 BUSY Output
12 PERROR Output
13 SELECT Output
14 *AUTOFD Input
15 NC
16 GND
17 FGND
18 P.L.H Output
19-30 GND
31 *INIT Input
32 *FAULT Output
33-35 NC
36 *SELECTIN Input
60
I/O Function
Strobe signal to read in 8-bit data
8-bit parallel signal
8-bit data request signal
Signal specifying printer busy
Signal specifying media out
Signal specifying if the printer is on-line
(printing enabled) or off-line (pausing)
Invalid (ignored)
- Not used
- Signal ground
- Frame ground
Peripheral logic high (pull up to +5 V at 10 kΩ)
- Ground for twisted pair return
Printer reset
Signal specifying printer error
- Not used
Invalid (ignored)