Using The Uts Control Line; Static Configuration; Active Configuration - Keysight VXI Bus 75000 C Series User And Programming Manual

Using the UTS Control Line

Using the UTS Control Line
The UTS line can be used to prevent the Keysight E1458A Digital I/O Module
from sourcing data on the data lines, independent of the programmed state of
the port. A high or open on the UTS line allows the port to operate normally.
When the UTS line is set LOW, the data line transmitter is disabled. The UTS line
can be connected and used in either a static or active configuration.
A port is set to transmit on the data lines when a SOUR:DIG:DATA command is
received and the programmed handshake is completed. Use the
SOUR:DIG:DATA:VAL? command to verify the programmed state of the port. The
SOUR:DIG:DATA:MON? command returns the actual state of the data lines.
These two commands may return different values if the UTS line is LOW.

Static Configuration

The UTS line can disable the port transmitter during program
development/debugging. Tie the UTS line for each port to ground. This
configuration ensures that the digital I/O module cannot transmit on the data
lines, independent of the programmed state of the port. The port data receivers
are not affected.

Active Configuration

The UTS line can be connected to an active signal from the peripheral to ensure
that digital I/O module does not attempt to transmit, independent of the
programmed state of the port. The peripheral should hold the UTS line LOW
when it is transmitting, and release the line when it is ready to receive. For
example, two Keysight E1458A Digital I/O Modules could be connected as shown
in Figure 3-1. The I/O line is set to a TTL Low when the port is programmed to
transmit. By connecting the I/O lines from each port to the UTS lines, the two
modules cannot transmit at the same time.
Keysight E1458A 96-Channel Digital I/O Module User Guide
Using the Keysight E1458A Digital I/O Module
49