Measurement Computing Digital488/80A - Manual (Page 75)

U - User Status
SYNTAX Uval Define status message val to send when the Digital488/80A is next addressed to
Talk, where val = 0 or bit , and where bit = bit value from 1 to 40 .
U0 Send status of Digital488/80A unit.
Ubit Send status of bit , where bit = bit value from 1 to 40 .
Note: After the U0 status string is read by the controller, any error conditions are cleared.
DESCRIPTION
The User Status (
U ) command U0 causes the Digital488/80A to send the status message when next addressed to
Talk, while the command Ubit (where bit is the bit value from 1 to 40 ) enables the controller to read any single bit
from the I/O ports.
The
U0 status string of the Digital488/80A may be read at any time without interfering with normal operation, and after
the string is read by the controller, any error conditions are cleared. When the command U0 is received, the format of
the U0 status byte returned by the Digital488/80A is as follows: *.*C#E#F#G#I###K#L####M###P#R#Y#
where each # equals the parameter(s) corresponding to that command. The leading information *.* is the revision
level of the Digital488/80A firmware.
When the command
Ubit is received, the format of the Ubit status message is an ASCII character 1 or 0 ,
depending on the level of the data line, and the state of the Invert ( I ) command I16 .
EXAMPLE 1: User Status
U0 - Digital488/80A Status
PRINT#1,"CLEAR08" Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;U0X" Line 2: Request the status of the Digital488/80A.
PRINT#1,"ENTER08",
INPUT#2,A$ Line 4: Read the status byte.
PRINT A$ Line 5: Display shows: 1.0C0E0F0G0I000K0L0000M000P0R0S00Y0
EXAMPLE 2: User Status Ubit - Bit Status
PRINT#1,"CLEAR08" Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;U22X" Line 2: Request the status of the Bit 22.
INPUT#2,A$ Line 3: Read the status message.
PRINT A$ Line 4: Display shows: 0 (Message is dependent upon the signal applied to the
input.)
Digital488/80A User’s Manual 967695 Digital488/80A Commands 69