Hitachi PH Instruction Manual page 49

1-38 ● Connection of signals
1.5.3-7 Reciprocative printing signal (input)
The following shows the connection terminal for the signal that delivers instructions
for a change in the order of characters to be printed.
(No-voltage contact)
A current of about 12 mA
flows.
When the input is OFF: Forward transport
When the input is ON: Backward transport
(Example)
Reverse direction printing signal
Print object detection signal
1.5.3-8 Print output signal (output)
The following shows the wiring of the signal that is outputted when a printing
operation is being conducted or completed by the IJ printer.
(a) Wiring
Load
● If a relay, solenoid, or other inductive load is employed, connect a
counterelectromotive force generation prevention diode in parallel with the load.
● The load circuit is for DC only. It cannot be used with an AC load.
Output specifications
Vd
GND
External device
● The output transistor (Tr) is of an open collector type. It operates as indicated below.
While printing is performed (printing-completed signal ON)
While no printing is performed (printing-completed signal OFF) : Tr OFF
TB1
GND
9
11 Signal
OFF state
ON state
1 2 3 1 2 3
1 2 3
1 2 3
ON
OFF
ON
OFF
100 ms min.
* Ensure that the interval between reciprocative printing signal changeover
(ON→OFF or OFF→ON) and print object detection signal input is at
least 100 ms.
TB1
Print output
12
13
GND
TB1
IL
12
13 V
Input specifications
●A no-voltage contact must be used for
input.
●In the case of noncontact, the following
requirements must be met.
Withstanding voltage : 12 VDC or more
Maximum drive current : 12 mA or more
Residual voltage : 2 V or less
Leak current : 0.1 mA or less
Drive method : Open collector
(The arrow indicates
the sequence of printing.)
+12V
Tr
CE
GND
IJ printer
: Tr ON