Star Micronics SP2000 user manual Drive circuit, Recommended drive unit is shown below

Drive circuit

The recommended drive unit is shown below.

F.G			1	With shield
			2
TR1		D1		L1	Peripheral
					unit 1
	+24V	7824	3
M-GND			4
					R3
TR2		D2		L2	4.7kΩ
					1/4W
			5
M-GND				Peripheral
+5V				unit 2	Compulsion
		R1			switch
TR3			6
	R2			Frame
				ground
		Printer side		User side

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 24Ω.

•Absolute maximum ratings for diodes D1 and D2 (Ta = 25°C) are: Average Rectified Current Io = 1A

Maximum forward surge current (60Hz, 1-cycle sine wave) IFSM = 40A

•Absolute maximum rating for transistors TR1 and TR2 (Ta = 25°C) are: Collector current Ic = 2A

Collector loss Pc = 1.2W

APPENDIX

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