Features and Functions 4
Keysight 34970A/34972A User’s Guide 225
34907A Multifunction Module
This module combines two 8-bit ports of digital input/output, a 100 kHz totalizer,
and two ±12V analog outputs. For greater flexibility, you can read digital inputs
and the totalizer count during a scan.
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.
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 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 ±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).
Port 1 (LSB)
Channel 01
Port 2 (MSB)
Channel 02
8
8
DIO
Bit 7
Bit 0
Bit 7
Bit 0
Channel 03
26 Bits
Gate
Gate
-IN
+IN
TOT
DAC 1
DAC 2
16
16
Channel 04
Channel 05
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