Bird Technologies 6091P - Manuale (Pagina 48)

Bird Model 6091 Calorimeter
36
Serial Polling Enable/Disable (SPE/SPD)
Function Issued by controller to enable or disable the serial poll sequence.
CAUTION
During remote operation, periodically monitor the bus service request line. Failure to
detect the service request can result in major equipment damage.
Remarks SPE command puts all devices in serial poll mode waiting to be addressed.
When addressed device issues status byte to controller.
State of bit 6 of status byte determines service requirements. (Refer to the status
byte section in this appendix.)
bit 6 = 1 service required
bit 6 = 0 no service required
Service request line not asserted for Command Error (bit 0) or Command Com-
plete (bit 3) conditions until after device is triggered.
SPD command clears status byte and ends serial poll sequence.
Statements National GPIB-PCII HP 200/300
IBRSP (UD%,SPR%) P=SPOLL(724)
Note: Decimal value of
status byte is returned
in variable SPR%. Note: Decimal value of
Status byte is returned in
variable P.