Measurement Computing Digital HS - Manual (Page 38)

fast as the slowest listener. The Digital488HS/32 is capable of transmitting bus data
at a rate greater than 1,000,000 bytes per second.
3.3 Serial Polling
The Digital488HS/32 can provide internal and external status in addition to
generating requests for service via the SRQ IEEE 488 control line. The following
shows the status bit positions contained within the Serial Poll Byte Status Register.
0 rsv 0 0 SB2 SB1 FULL EMPTY
DIO8 DIO7 DIO6 DIO5 DIO4 DIO3 DIO2 DIO1
Serial Poll Byte
Bit Assignments
These status bits include:
DIO1 FULL The input port is Full.
Data may be read from the input port.
DIO2 EMPTY The output port is Empty.
Data may be written to the output port.
DIO3 SB1 External Status Bit #1 input.
Level Sensitive Bit. Rising edge SRQ generating if
enabled.
DIO4 SB2 External Status Bit #2 input.
Level Sensitive Bit. Rising edge SRQ generating if
enabled.
DIO5 Not Used Always 0.
DIO6 Not Used Always 0.
DIO7 rsv Reserved Bit. Indicates the Digital488HS/32 caused
the SRQ.
DIO8
Not Used Always 0.