HP 34970A Totalize Input, Analog Output (DAC), Digital Input/Output, HP 34907A Multifunction Module, HP 34907A Multifunction Module

Chapter 4 Features and Functions

HP 34907A Multifunction ModuleHP 34907A Multifunction Module

This module combines two 8-bit ports of digital input/output, a 100 kHz totalizer, and two ±12 analog outputs. For greater flexibility, you can read digital inputs and the totalizer count during a scan.

Bit 0

8		Port 1 (LSB)
		Channel 01
	DIO	Bit 7
		Bit 0
8		Port 2 (MSB)
		Channel 02
		Bit 7

Digital Input/Output

The DIO consists of two 8-bit ports with TTL-compatible inputs and output. The open- drain outputs can sink up to 400 mA. From the front panel, you can read data from only one 8-bit input port at a time. From the remote interface, you can read both ports simultaneously as a 16-bit word only if neither port is in the scan list.

	+IN
26 Bits	-IN
TOT	Channel 03
	Gate
	Gate

Totalize Input

The 26-bit totalizer can count pulses at a 100 kHz rate. You can configure the totalizer to count on the rising edge or falling edge of the input signal.

ATTL high signal applied to the “G” terminal enables counting and a low signal disables counting. A TTL low signal applied to the “G” terminal enables counting and a high signal disables counting. The totalizer only counts when both terminals are enabled. Move the Totalize Threshold jumper to the “AC” position to detect changes through 0 volts. Move the jumper to the “TTL” position (factory setting) to detect changes through TTL threshold levels.

16

16

DAC 1 Channel 04

DAC 2 Channel 05

Analog Output (DAC)

The two analog outputs are capable of outputting calibrated voltages between ±12 volts with 16 bits of resolution. Each DAC channel is capable of 10 mA maximum current. You must limit the DAC output current to 40 mA total for all three slots (six DAC channels).

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