Rice Lake Star SP700 - Manual (Page 119)

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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.
• Absolute maximum ratings for diodes D1 and D2 (Ta = 25
°C) are:
Average Rectified Current Io = 1A
• Absolute maximum rating for transistors TR1 and TR2 (Ta = 25
°C) are:
Collector current Ic = 2A
Collector loss Pc = 1.2W
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