Racal Instruments 1256E, Руководство пользователя

Страница: 159 / 204

1256E User Manual
Racal Instruments
©
2002 Digital Module Operation 7-13
The query form of the command may be used to read the present
index location for the specified port. For example, the command:
DIGITAL:SYNC:INDEX? (@7(4))
would return the reply:
5
The DIGITAL:SYNCHRONOUS:DATA? query may be used to read
the data that has been previously loaded to a synchronous output
port. This command will return all of the data bytes (up to 256)
downloaded to the specified port.
The DIGITAL:SYNCHRONOUS:POINTS command is used to
define the maximum number of data bytes that will be acquired for
the specified synchronous input port. This tells the 1256 how many
data bytes to collect for the specified port(s). The value must be
between 0 and 256.
The DIGITAL:SYNCHRONOUS:POINTS? query may be used to
read the number of points defined for the synchronous input port(s)
specified.
After power-up, and after executing a *RST command, the number
of points to acquire for all ports is set to 0.
The DIGITAL:SYNCHRONOUS:INDEX? query may be used to
determine the number of data bytes stored in a synchronous input
port’s buffer. This number will always be less than or equal to the
maximum number of points for the port as specified with the
DIGITAL:SYNCHRONOUS:POINTS? command.
Arming the Digital
Modules
The DIGITAL:SYNCHRONOUS:STATE command is used to “arm”
one or more 1260-114 digital modules. These modules must be
“armed” before they will respond to CLKIN pulses and perform the
synchronous operations.
The command accepts one or more module numbers or module
names. Note that entire modules, not individual ports, are armed
using this command. The following examples illustrate the use of
the command.
Arm the digital module at module address 7:
DIGITAL:SYNC:STATE (@7),ON
Arm the digital modules at module addresses 3, 5, and 9: