PEX-400111
Interface Corporation
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34
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8.3 Signals
Signal Description
Serial interface
Signal
Pin Number
Direction
Description
CD
23
Data carrier detect
RD
27
Input
Receive data
SD
29 Transmit
data
ER
31
Output
Data terminal ready
DR
59
Input
Data set ready
RS
61 Output
Request to send
CS
63
Clear to send
CI
65
Input
Call indicator
Parallel interface
Signal
Pin Number
Direction
Description
nSTROBE
37
Output
This signal shows that valid data are output (on D0
to D7). It is an active-low signal.
D0 to D7
3, 5, 7, 9, 11,
13, 15, 17
Input/output
These signals are data bus.
nACK
39
This signal shows that the printer receives data
correctly by negative pulses. It is an active high
signal.
BUSY
41
This signal shows that the printer is not ready to
receive data. It is an active-high signal.
PE
43
This signal shows paper-out condition. It is an
active-high signal.
SELECT
45
Input
This signal shows that the printer is selected. It is
an active-high signal.
nAUTOFDX
47
Output
This signal is an auto line-feed signal. It is an
active-low signal.
nERROR
49
Input
This signal shows that an error occurred. During
error condition, the printer keeps low level. It is an
active-low signal.
nINIT
51
This signal is an initialization signal. It is an
active-low signal.
nSELECTIN
55
Output
This signal selects the printer. It is an active-low
signal.
