Multiple-Port Operations - Keysight VXI Bus 75000 C Series User And Programming Manual

Multiple-Port Operations

If port 3 is in the default POSitive polarity mode, the TTL levels set on the data
lines by any of the program lines above will be:
Port numbers range from 0 to 11 for single-port operations. The section
"Multiple-Port Operations" later in this chapter describes port numbering and
byte order for multiple-port operations. For single-port operations, the most
significant bit is bit 7. The table below shows the bit numbers and the
corresponding data lines.
Multiple-Port Operations
The Keysight E1458A Digital I/O Module supports multiple-port operations. You
can combine operations using 2, 4, 8, or all 12 ports with a single SCPI
command. Multiple-port operations are shown in the SCPI command syntax as
the optional keyword [:type]. For example, this SCPI command syntax initiates a
handshake and returns one or more values:
The optional keyword [:type] is replaced by one of the following keywords:
The SCPI keyword :DATAn specifies the port to be used for operations by
replacing n with the port number. Multiple-port operations have fixed values
allowed for n. For all operations, if n is omitted, port 0 is assumed. The values
allowed for n are:
Keysight E1458A 96-Channel Digital I/O Module User Guide
TTL level High Low
Data line D3_7 D3_6
Dn_7 Dn_6 Dn_5
Bit 7 Bit 6 Bit 5
MSB
MEAS:DIG:DATAn[:type]?
:BYTE This keyword, or no keyword (default), is used for 8-bit
port operations.
:WORD This keyword is used to combine 2 adjacent ports for
16-bit port operations.
:LWORd or
:LW32 Either keyword is used to combine 4 adjacent ports for
32-bit operations.
:LW64 This keyword is used to combine 8 adjacent ports for
64-bit operations.
:LW96 This keyword is used to combine all 12 ports for
96-bit operations.
Using the Keysight E1458A Digital I/O Module
High Low High
D3_5 D3_4 D3_3
Dn_4 Dn_3 Dn_2
Bit 4 Bit 3 Bit 2
Low High Low
D3_2 D3_1 D3_0
Dn_1 Dn_0
Bit 1 Bit 0
LSB
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