The I/O Line (Output); The Sts Line; The Pir Line - Keysight VXI Bus 75000 C Series User And Programming Manual

Port Description

The I/O Line (Output)

Each port has an I/O line. An I/O line is an output from the Keysight E1458A
Digital I/O Module to the peripheral and has two states, TRU@E or FALSE. The
state of the I/O line is not directly programmable. The I/O line polarity cannot be
changed.
the data transceiver of that port is enabled for input. The peripheral should
respond to the signal by enabling itself to send data.
the data transceiver of that port is enabled for output. The peripheral should
respond to the signal by enabling itself to receive data.

The STS Line

Each port has a status line labeled STS. The STS line is an input line to the digital
I/O module. The use of the STS line is only at the register level and is not
supported by SCPI commands. Refer to Appendix B, "Keysight E1458A Register
Information," for more information about this line.

The PIR Line

Each port has a peripheral interrupt request line labeled PIR. The PIR line is an
input line to the digital I/O module. The use of the PIR line is only at the register
level and is not supported by SCPI commands. Refer to Appendix B for more
information about this line.
Keysight E1458A 96-Channel Digital I/O Module User Guide
When the I/O line is:
When the I/O line is:
To prevent damage to the digital I/O module, when the I/O line is
set for Output (TTL Low), the peripheral MUST NOT attempt to
source on any data lines.
The I/O, CTL and RES lines are true open collector output lines
(see Figure 3-3). An external pull-up is required for proper
operation. The FLG, PIR and STS input lines have a 3k/6.2k
pull-up termination. If the PIR and STS lines are not used, then
connecting them to the I/O and CTL line will provide the pull-up
that the I/O and CTL lines need.
Using the Keysight E1458A Digital I/O Module
TTL High =TRUE = 1 = Input
TTL Low = FALSE = 0 = Output
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