Spirent DLS 6700, Operating Manual

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Chapter 4: REMOTE CONTROL
Spirent Communications
7104000557
Page 4-9
Bits 7 to 0 have values of 128, 64, 32, 16, 8, 4, 2 and 1, respectively.
For example, if bits 3 and 5 are set then the integer value is 40 (8+32).
*WAI Wait to continue
Type: Synchronization command
Function: Used to delay execution of commands. The DLS 6700 will ensure that
all commands received before “*WAI” are completed before processing
any new commands. This means that all further communication with
the 6700 will be frozen until all pending operations are completed.
4.6 Status Reporting
There are two registers that record and report the system status, the Status Byte
Register (STB), and the Event Status Register (ESR).
For both registers there are three basic commands: one to read the register, one to
set the enabling bits, and one to read the enabling bits (<NRf> is the new value of the
register):
4.6.1 Status Byte Register (STB)
The bits of this register are mapped as follows:
bit 4:
MAV (Message Available Bit)
Indicates that the Output Queue is not empty. If MAV goes high and is
enabled then MSS goes high.
bit 5: ESB (Event Status Bit)
It indicates that at least one bit of the Event Status Register is non zero
and enabled. If ESB goes high and is enabled then MSS goes high.
Status Byte Register Event Status Register
Read Register *STB? *ESR?
Set Enabling Bits *SRE <NRf> *ESE <NRf>
Read Enabling Bits *SRE? *ESE?