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Interface
(2) Signal line and pin assignment
Pin No. Signal name
1
STROBE
2-9
DATA0-7
10
ACKNLG
11
BUSY
12
PERROR
13
SELECT
14
AUTOFD
15
NC
16
SGND
17
FGND
18
P.L.H
19-30
GND
31
PRIME
32
FAULT
33
GND
34
NC
35
NC
36
SELECTIN
(3) Parallel port status signals when an error occurs
The following table shows the status signal change when an error occurs.
Under the specifications for this bi-directional parallel interface, the parallel port status signals
when an error occurs are, as shown below, partially processed differently than with Compatible
mode used up till now. When bi-directional parallel interface is on in the setting menu, even if a
printer error has occurred, the BUSY signal line is not active ("H").
Error
Paper end
Error other than paper
end
• Head open
• Other
Conditions for Busy
CL-S6621
I/O
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 end
Output
Signal specifying if the printer is on-line (printing enabled)
or off-line
Input
Invalid (ignored)
---
Not used
---
Signal ground
---
Frame ground
Output
Peripheral logic high (pulled up to +5V at 1KΩ)
---
Ground for twisted pair return
Input
Printer reset
Output
Signal specifying printer error
---
Signal ground
---
Not used
---
Not used
Input
Invalid (ignored)
Compatible mode
L → H
Busy:
L → H
PError:
H → L
Select:
H → L
Fault:
L → H
Busy:
PError:
L→ unchanged
H → L
Select:
H → L
Fault:
• Receive buffer full
• Data being read
• Error
2-62
Function in Compatible Mode
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