34907A Multifunction Module - Agilent Technologies 34901A User Manual

Chapter 4 Features and Functions

34907A Multifunction Module

34907A Multifunction Module
This module combines two 8-bit ports of digital input/output, a 100 kHz
totalizer, and two
read digital inputs and the totalizer count during a scan.
Bit 0
8
Bit 7
DIO
Bit 0
8
Bit 7
+IN
-IN
26 Bits
TOT
Gate
Gate
16
DAC 1
Channel 04
16
DAC 2
Channel 05
174
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±
12V analog outputs. For greater flexibility, you can
Digital Input/Output
The DIO consists of two 8-bit ports with
Port 1 (LSB)
TTL -compatible inputs and output. The open-
Channel 01
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
Port 2 (MSB)
Channel 02 16-bit word only if neither port is in the scan list.
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.
A TTL high signal applied to the " G " terminal
enables counting and a low signal disables
Channel 03
counting. A TTL low signal applied to the "
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.
Analog Output (DAC)
The two analog outputs are capable of outputting
calibrated voltages between
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).
"
G
±
12 volts with 16 bits