Measurement-computing Digital232 Manual de usuario descargar pdf (Pagina 37)

Section 3 Command Descriptions

3.15

Service Request (SRQ) Mn

The

Service Request (SRQ

) mode is used by the

Digital232

to alert the host

computer to one of several conditions described below. When a service request

condition occurs, the string “

SRQ n

” will automatically be sent to the host computer,

where “n” is a number from 1 through 7. The number “n” is determined by the

conditions which have caused the service request, and is the sum of M1, M2, and M4.

Multiple

SRQ

conditions can be enabled simultaneously. If multiple

SRQ

commands are contained within the same command string, each

SRQ

command

should be followed by an

Execute

command (X). An alternative is to add the values

of each

SRQ

command desired, and send one command with the sum of the desired

commands. The

SRQ

commands are ORed together as received. The programmed

SRQ

modes will remain enabled until the

command is sent, or a

Reset (@)

command is received.

default mode disables the SRQ function, preventing the Digital232 from

generating a Service Request

will generate a Service Request when the Service Input line makes a

transition. Refer to the Invert command (I64) description for

programming the polarity of the Service input line.

will generate a Service Request when the EDR input makes a transition.

Refer to the Invert command (I32) description for programming the

polarity of the EDR input line.

will generate a Service Request when a programming error occurs. For

example, attempting to select an ‘F6’ format when no ‘F6’ format exists

will generate a Service Request when the M4 mode is selected.

Example:

reset the

Digital232

M4 select

SRQ

on error

F7 send an invalid command.

ERROR LED

should illuminate and “SRQ” is sent to the host

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 58 59

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Measurement-computing Digital232 Manual de usuario Pagina 37

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