Star Micronics SP298 Series - Manual (Page 141)

138
APPENDIX
Drive circuit
The recommended drive unit is shown below.
Notes
• Peripheral Units 1 and 2 cannot be driven simultaneously.
• For continuous driving, do not use drive duty greater than 20%.
• The status of the compulsion switch can be known from the following.
Star mode : The status of the compulsion switch can be known by
using the automatic status function or <ENQ>
commands. In the case of ENQ status, bit 7 will be
“1”when pin No. 6 of the peripheral unit drive circuit
is high (switch on).
ESC/POS mode : The status of the compulsion switch can be known by
using the automatic status function, <DLE><EOT>n,
and <ESC>“u”n commands.
Parallel interface: The status of the compulsion switch can be known by
pin No. 34 on the parallel interface connector. When
the compulsion switch is on, pin No. 34 will be low.
This can be checked by using the compatibility mode.
• Minimum resistance for coils L1 and L2 is 24
Ω
.
7824
F.G
TR1
M-GND
TR2
M-GND
TR3
+5V
+24V
R1
R2
6
5
4
3
2
1
L1
L2
R3
4.7k
Ω
1/4W
Frame
ground
Printer side User side
D1
D2
Peripheral
unit 1
With shield
Peripheral
unit 2
Compulsion
switch
Drive output: 24V, 1.0A max.