EXFO T200S, User Manual, Page: 51 / 146

Remotely Controlling the T200S
Tunable Laser Source
45
Communication Principle
Communication Principle
EXFO supplies commands that follow the guidelines determined by the SCPI consortium
for your T200S.
The present section gives you information to help you use the provided commands, to
remotely control your instrument.
Standard Status Reporting
Each device has four status registers with a structure complying with the IEEE 488.2
standard. These registers allow the controller to monitor events and get useful information
on the status of the devices it controls.
³
Standard Event Status Register (ESR)
³
Standard Event Status Enable Register (ESE)
³
Status Byte Register (STB)
³
Service Request Enable Register (SRE)
The following diagram is a useful aid in understanding the general commands and how a
service request (SRQ) is generated.
Using a service request, a device notifies the controller that an event requiring special
attention occurred. The controller will then find which device generated a SRQ (its RQS bit
is set) and the causes of it.