Measurement Computing Serial488/4 - Manual (Page 70)

Section 3 Command Descriptions
3.31
Serial Poll Status Byte
The Serial Poll Status byte is sent upon receiving the serial poll command from
the controller. Refer to the SRQ description for details on how the Serial Poll Status
byte is affected. Below is a description of the significance of each bit in
the Serial
Poll Status byte.
Bit Location Value (SRQ Bit Value if set to logic 1)
DIO1(LSB)
1 serial data available on port 1
DIO2 2 serial data available on port 2
DIO3 4 serial data available on port 3
DIO4 8 serial data available on port 4
DIO5 16 Ready for more commands
DIO6 32 Command Error
DIO7 64 Service Request bit
DIO8 (MSB) 128 Memory low warning
Serial Poll Bit Description
DIO1 The DIO1 bit is set by the receipt of serial data on port 1. When enabled by
the M1 command this condition will also generate a Service Request. DIO1 is
cleared when no more data is available to be read on port 1.
DIO2 The DIO2 bit is set by the receipt of serial data on port 2. When enabled by
the M2 command this condition will also generate a Service Request. DIO2 is
cleared when no more data is available to be read on port 2.
DIO3 The DIO3 bit is set by the receipt of serial data on port 3 When enabled by
the M4 command this condition will also generate a Service Request. DIO3 is
cleared when no more data is available to be read on port 3.
DIO4 The DIO4 bit is set by the receipt of serial data on port 4. When enabled by
the M8 command this condition will also generate a Service Request. DIO4 is
cleared when no more data is available to be read on port 4.
DIO5 The DIO5 bit is set after an entire command string has been received and
processed by the Serial488/4. The bit is cleared w hile the Serial488/4 is
processing commands which have been received from the controller. When
used with the M16 command, a Service Request will also be generated w hen