Chapter 2 Operating Principles
2-4. Interface
2-49 CL-S400DT
(2) Signal line and pin assignment
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 10KΩ)
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)
(3) Parallel port status signals when an error occurs
The following table shows the status signal change when an error occurs.
Error Compatible mode
Paper end Busy:
PError:
Select:
Fault:
L → H
L
→ H
H
→ L
H
→ L
Error other than paper end
• Head open
• Other
Busy:
PError:
Select:
Fault:
L → H
L
→ unchanged
H
→ L
H
→ L
Conditions for Busy • Receive buffer full
• Data being read
• Error
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