Remote Control
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The command will return the pacing method as a string. For example, if the pacing
method is RTS/CTS, the returned message will be:
RTS/CTS
To simplify the setting of the serial interface, we used a slightly modified SCPI
command set. The SCPI standard requires separate settings for the RTS/CTS flow
control and XOn/XOff pacing, and differentiates between the receive and the transmit
sides. The command set of the DLS 50 combines the ":RTS" and the "XON" settings
into one ":PACE" command.
Note that the SCPI standard assumes a DTE configuration, whereas the DLS 50 is
configured as a DCE port (thus not requiring a Null Modem).
4.8 DLS 50 Synchronization
The program controlling the DLS 50 can use three different commands to synchronize
with the DLS 50: *OPC, *OPC? and *WAI. Following are the main differences:
Set
Operation
Complete
bit when
Done
Return "1"
when
operation
complete
Raise SRQ
when
operation
complete
Block
comm. with
the DLS 50
Required
Enable
Bit(s)
*OPC Yes No Yes (1) No Operation
Complete,
ESB
*OPC? No Yes Yes (2) No MAV
*WAI No No No Yes none
(1) if "Operation Complete" and ESB are enabled
(2) if MAV is enabled
The main difference between OPC and WAI is that WAI will block any further
communication with the DLS 50 until all pending operations are completed. The main
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