Keysight 34950A User’s Guide 13
Basic Digital I/O Operations
Channel Numbering and Width
The digital channels are numbered by bank; 101 through 104 and 201 through
204 for banks 1 and 2 respectively.
Using SCPI commands you can group digital I/O channels together to allow
16- or 32-bit operations. The first and third channels on a bank can be control
channels. Width and direction of the memory operations are controlled by the
width and direction of the first channel on the bank (i.e., 101 or 201). In the SCPI
language for the 34950A, BYTE refers to 8-bit operations, WORD refers to 16-bit
operations, and LWORd refers to 32-bit operations.
This table illustrates how the channels are numbered for each operating
configuration.
Reading Digital Data
The simplest way to read a digital channel is using the MEASure:DIGital? query.
This query sets the channel to be an input channel and sets all other channel
parameters to the default settings.
For example, sending the following SCPI command to a Digital I/O module
installed in slot 1 of the mainframe will read the value of the 8-bit channel 102. An
unsigned integer value is returned that represents the state of the 8 bits on
channel 102.
Bank 1 Bank 2
Channel
BYTE (default)
101 102 103 104 201 202 203 204
8-bits 8-bits 8-bits 8-bits 8-bits 8-bits 8-bits 8-bits
WORD
101 103 201 203
16-bits 16-bits 16-bits 16-bits
LWORd
101 201
32-bits 32-bits
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