Keysight 34950A User’s Guide 17
Handshaking
Handshaking provides a means to synchronize the input or output of digital data.
By default, no handshaking is used; data is input or output as the command is
executed. The handshake is configured per bank.
The 34950A provides a synchronous handshake mode (strobe handshake). You
can use this mode with basic input and output operations. You must use this
handshake mode to use buffered I/O (see “Buffered I/O Operations” on page 25).
The handshake is performed using three lines on each bank. The lines are labeled
H0, H1, and H2. The function of each line is set by the input or output mode in
use. Since there are only three handshake lines per bank, the SCPI handshake
commands are only valid for the first channel in a bank. Once handshaking is
enabled, it applies to the width of the first channel in the bank.
The three handshaking lines on each bank also differ slightly if you are using
buffered (memory) I/O (see page 25) or unbuffered I/O operations. You can also
perform unbuffered operations without any handshake. The function of each line
for each mode of operation is defined in the table below.
The following handshake command sets the synchronous handshaking mode for
the channels in bank 1.
CONF:DIG:HAND SYNC, (@1101)
This form of the handshaking command also allows you to optionally set the input
threshold, output drive level, and polarity of all the handshake lines. For example,
the following command sets bank 2 to use synchronous handshaking, with an
input threshold of 2.5 V, an output drive level of 2.5 V, and normal polarity. Other
H0 H1 H2
Unbuffered Synchronous Input I/O Direction (output) Strobe (output) Not Used (Hi-Z)
Unbuffered Synchronous Output I/O Direction (output) Strobe (output) Not Used (Hi-Z)
Buffered Synchronous Input Start/Stop (output) Not Used (Hi-Z) Input Strobe (input)
Buffered Synchronous Output
(internal clock)
Start/Stop (output) Strobe (output) Not Used (Hi-Z)
Buffered Synchronous Output
(external clock)
Start/Stop (output) Not Used (Hi-Z) Output Strobe (input)
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