GeBe GPT-4454, User Manual

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Interfaces • Parallel Interface 9
GeBE E + F GmbH • www.gebe.net • GeBE Dok.Nr.: SMAN-E-510-V1.5 Thermal Printer GPT-4454
6.2 Parallel Interface
6.2.1 Centronics Adapter with SUB-D 25 Pin Connector
The GKA-407 connects the adapter with the printer (to J5).
The GKA-302 establishes a 1:1 connection from the adapter to the parallel port of a PC.
6.2.2 PIN Assignment at the 25pin SUB-D Connector of the Adapter
The peripheral devices that are connected to the interfaces and the DC circuits of this printer
have to meet the requirements for extra-low safety voltage (SELV) with limited power in ac-
cordance with EN/IEC 60950.
Pin Signal
Input/Output
Comment
1
2
Strobe/
DB0
I
I
taking over data DB0 ..7 with the rising edge
3
4
5
6
DB1
DB2
I
I
DB3
DB4
I
I
7
8
9
10
DB5
DB6
I
I
DB7
/Acknowledge
I
O
11
12
13
14
BUSY
Paper End O
O
Select
Auto Line Feed O
I
becomes high with the falling edge of /Strobe
see error messages
see error messages
can be connected with Select (Windows operation)
15
16
17
18-25
/Fault
/Input-Prime
O
I
Select in
GND digital
I
see error messages
used to trigger a RESET
used for reactivation
6.2.3 Timing of the Parallel Interface
Time Name min ( µs) typ ( µs) max ( µs) Comment
Tack
Tba
Ackn.pulse width
delay Busy-Ackn.
17
5,5
Tbs
Tdsu
Thold
Tsb
Busy Setup
Data Setup
0,5
0,5
Data hold
delay Strobe-Busy
0,5
0,5
Time before the next Strobe
For open collector control, the minimum time is 3.5 µs. This value can
be changed to other values through alternative placement of the RC-
filters.
Tstrb Strobe pulse width 0,5
BBBBuuuussssyyyy
DDDDaaaatttteeeennnn
SSSSttttrrrroooobbbbeeee////
AAAAcccckkkknnnn////
Tstrb
Thold
Tsb
Tack
Parallele Schnittstelle
Tba
Tdsu
Tbs