User`s manual

CHAPTER 3 PROGRAMMING REFERENCE

3.4.17. SPOLL

Purpose :

This command conducts a serial poll of the interface bus. It returns the value (0-

255) of an eight-bit byte representing the device’s status.

Offset :

SPOLL%=39

Syntax :

CALL SPOLL%(ADDR%,RESPONSE%) ----BASIC

CALL ABSOLVTE(ADDR%,RESPONSE%,SPOLL%) ----BASIC Compiler

Parameter :

ADDR% - The address of the device to be serial polled. Must be within 0

and 30.

RESPONSE% - An integer with the value 0-255 of an eight bit byte representing

the status of the device specified.

Bus Activity :

ATN is set true.

UNL is sent.

TAD is sent.

MLA is set.

SPE is sent.

ATN is set false.

Data byte is read.

ATN is set true.

SPD is sent.

UNT is sent.