B&B Electronics USB-4751/4751L user manual Digital Input/Output, Counter, General

Appendix A Specifications

A.1 Digital Input/Output

Channels	48 Bi-directional (24 for USB-4751L)
Programming	8255 PPI Mode0
Mode
Input Voltage		Low		0.8 V max
	High			2.0 V min
Output Voltage		Low		0.5 V max. @ 12mA (sink)
	High			3.8 V min. @ -12mA (source)(each line)
				3.8 V min.@5mA(source)(high of every line)
+5V Output	100mA			max.
Interrupt Mode	PC0 source; PC4 gate/PC0 source
A.2 Counter
Channels			2 independent
Resolution			32-bit counters (low 16bit by hardware and high 16bit
			by ARM)
Compatibility			TTL compatible logical level input
Base Clock			External				8MHz max.	2 independent program-
								mable clock sources
			Internal				20MHz max.
Frequency			Input frequency from 0.1Hz to 10Mhz
measurement
PWM Generation			2Hz to 10Mhz
External Input Divide			2 to 65535
A.3 General
I/O Connector Type	Opto-22 * 2 and 10-pin screw terminal *1
Dimensions	132 X 80 X 32 mm (5.2” X 3.2” X 1.3”)
Power	5 V @ 500 mA max.
Consumption
Temperature	Operation					0~60° C (32~140° F) (refer to IEC 68-2-1, 2)
	Storage					-20~70° C (-4~158° F)
Relative Humidity	5%~95% RH				non-condensing (refer to IEC 68-2-1, 2)

USB-4751/4751L User Manual 18