Parallel Cable Pin Signal Descriptions - Black Box LE3840A Manual

A.6 Parallel Cable Pin Signal Descriptions
Pin Numbers
1
2-9
10
11
15
31
12, 13, 32
Table A-2. Parallel Cable Pin Signals.
Description
A signal that goes low for Centronics for a minimum of
one microsecond, indicating valid data on each data line.
It is an input when receiving data and output when
sending data.
The eight data lines. For the Centronics interface, a high
signal is a Binary 1 and a low signal is a Binary 0.
Acknowledges the input of a character. It is provided to
an attached computer, but the Ethernet Print Server does
not require it from an attached printer.
Used for hardware data flow control. When data is
transmitted, the Ethernet Print Server looks at the state of
this line to determine if the device is ready to receive data.
When receiving data, this line is used to show that the
Ethernet Print Server is ready to receive (low), or that its
buffer is full (high).
This is an external clock used by some devices, though
not very many. It provides clock output to devices that
transmit it.
This signal goes low on reset or power-up to reset a
printer to its start-up default.
Held at a constant state compatible with most devices.
Many devices do not use these pins at all.
APPENDIX A: Cable Specifications
127