- Mack User's Guide USB U2781A

38 U2781A User’s Guide
3 Features and Functions
4 During this identification operation, the trigger bus is used.
Hence, any triggering activities on the backplane would be
blocked.
5 Prior to any triggering activities, you must stop the
configuration activity by sending the following command:
SYSTem:IDentity {0|OFF}
Simultaneous Synchronization (SSI)
Simultaneous Synchronization (SSI) provides synchronization
between the USB modules. Figure 3- 7 illustrates an example of
SSI.
SSI allows you to set one of the modules as MASTER and others
as SLAVE. MASTER module sends the SSI signal to the slave
modules via the backplane trigger bus. SLAVE modules will
then receive the signal and begin synchronization with MASTER
module.
The SCPI command below is used to set the module as master:
CONF:SSI MAST
Send the SCPI command below to set the module as SLAVE:
CONF:SSI SLAV
NOTE
• Do not execute the above mentioned steps when the USB modules are in the
process of acquiring data.
• You do not need to perform the above pre-configuration if you are using the
Agilent Measurement Manager software. You are only required to press the
“Refresh” button.
NOTE
Only ONE master is assigned.