Interfaces
AppendixInterfaces
Standard PC cables can be used for the connections.
Parallel Interface to the System
The parallel interface to the system is a Centronics interface; it corresponds to the uni-
directional LPT interfaces of PCs, i.e. the printer does not transmit replies.
Technical Data :
Data Transmission:
8 bit parallel, unidirectional
Synchronization:
STROBE/N impulse, generated by the system
Handshaking:
ACKNLG/N and BUSY
Signal Level:
All interface signals are TTL compatible
Connector Type:
26-pin Centronics connector
Allocation of Connectors and Description of Signals
Pin
Name
Direction
Description
of Signal
1
STROBE/N
Input
Strobe impulse for reading in data. In the idle state,
the signal is “high”. Immediately after the change to
“low”, the data are read by the printer. The impulse
length must be at least 0.5
µ
s at the printer.
2
DATA0
Input
These signals are the 8 parallel data bits.
3
DATA1
Input
“High” corresponds to bit value “1",
4
DATA2
Input
“Low” corresponds to bit value “0".
5
DATA3
Input
6
DATA4
Input
7
DATA5
Input
8
DATA6
Input
9
DATA7
Input
Appendix
Interfaces
GB - 85
