DLS DLS 400A, Руководство по эксплуатации

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• the SRQ line can be raised automatically when there is an error by enabling
the ESB bit (bit 5) in the Status Byte Register with *SRE 32 and by enabling
the error bits in the Standard Event Status Register with *ESE 60 (bit 2, 3, 4
and 5).
NOTE: The Factory default is to clear all enable registers on power up. See the descrip-
tions of the *PSC, *ESE and *SRE commands in chapter 9 for more details.
We recommend that you set the DLS 400 to raise the SRQ line when there is a message
available and when there is an error.
7.1.3 Resetting the DLS 400
To reset the DLS 400, use the “Device Clear” command as defined in the IEEE 488.1
standard. This has the same effect as the power-up reset.
Shunt JP2 on the controller card determines whether the “Interface Clear” line resets the
whole unit or just the IEEE 488 interface. Setting JP2 in the IFC position (pin 1 and 2)
resets only the interface when IFC is received. In the “RESET” position (pin 2 and 3), IFC
resets the entire unit. The factory default is to set JP2 in the IFC position, pin 1 and 2.
7.1.4 Message Terminators
Messages to the DLS 400 must be terminated with either a Line Feed character (ASCII
<LF>, decimal 10, hex 0A), an IEEE 488.1 EOI signal or both. Messages from the DLS
400 are always terminated with a Line Feed character and the IEEE 488.1 EOI signal.
Note that some languages, such as BASIC, may automatically append a carriage return
and a line feed at the end of messages. The carriage return character is not a valid termina-
tor, and will invalidate the last command. To avoid this problem, you can append a semi-
colon after a string (after the quotes) when printing to the IEEE 488 port. Another solution
is to append a semi-colon at the end of the command itself (inside the quotes), so that the
carriage return can be interpreted as a second command, and be simply discarded by the
DLS 400. For example:
PRINT #1,”:set:channel:length 1000”+CHR$(10); Preferred solution
or
PRINT #1,”:set:channel:length 1000;” Alternate solution