ABLE Ap25 User Manual - page 4
4.2 Parallel and Serial Interface Selection
Serial and parallel data modes are selected using D7 (pin 1 on J3):
Parallel mode is selected if D7 is held low (connected to 0V) for a period of 100
ms after the
printer is reset.
Serial mode is selected if D7 is held high or left unconnected (internal pull-up to +5V) for a
period of 100
ms after the printer is reset.
In “classic” mode, the parallel interface is selected by having D7 low (logic “0”) at power up. In some
parallel applications the port driving this pin may be indeterminate at power up and so an alternative
parallel select is provided (internal jumpers S5/S6) factory set. If either of the two serial/parallel select
pins are held to ground on start up, then parallel mode is selected. Both pins must be left high to
select serial data. In order to change from serial to parallel, or from parallel to serial, the printer must
be reset.
Serial data Baud rates are selected on D5 and D6 when the printer is in serial mode.
Serial data Baud rates:
0
1
0
1
D6
0
1
1
0
D5
9,600
2,400
1,200
300
Baud
Note that the combination for 9600 Baud was used to select 110 Baud in the Ap24 family (110 Baud
is not available in the Ap25). In order to implement the baud rate the printer must be reset.
4.3 EMC Compliance
As a component, the Ap25 is outside the scope of the EMC Directive and the user must take
responsibility for the compliance of the complete equipment or installation.
5 OPERATION and PROGRAMMING
5.1 Parallel Data Mode
D7 to D0 are the data connections for parallel mode 8 bit data. If using one of the backwards
compatible 7 bit character sets (Ap24 family) D6 to D0 are the data connections. Positive true ASCII
Fig. 5.1 Parallel Connection to a PC
Ap25 Users’ Guide Page 3 of 8
Printer J3
2
4
5
6
8
PC Parallel Port
1
2
3
7
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
10 / 11
19 / 12
NC
NC
NC
D7
D6
D5
D4
D3
D2
D1
D0
Busy
Invert
GND
GND
VCC
Reset
Strobe
Mech
Strobe
D0
D1
D2
D3
D4
D5
D6
GND
Ack / Busy
Paper end / GND
Error