SCPI (Standard Commands for Programmable Instruments). Tonghui TH2515

TH2515 Operation Manual command is sent, you will be unable to operate TH2515 from the front panel including the soft key LOCAL. Execute the LOCAL command to undo LOCAL LOCKOUT.

 REMOTE

Set the control mode as remote control.

 SPOLL

The SPOLL (serial poll) command is set the bus address status byte. 8 bytes are used to shield, read and judge the instrument operating status.

 SERVICE REQUEST

When TH2515 requires the controller to execute a task, it will send out a SRQ service request control signal. SRQ, deemed as an interruption, will inform the controller to prepare the transmitted data or that errors exist on the instrument. As soon as TH2515 sends a SRQ service request signal, it will set the status byte to 6. 6 bytes are RQS request service bytes and sometimes connects with serial poll to act as the status byte.

When TH2515 enables the SPOLL command, it will clear the RQS request service bit and the SRQ string. Each bit in a status byte will enables a SRQ service request. User can shield the status byte to judge which bit causes TH2515 to set SRQ. For details, see

“Status Byte”.

 TRIGGER (GET)

Trigger bus command. This command can be sent to a selected device or all listener devices. It is necessary to assign TH2515 as a listener device firstly and then set the trigger mode as bus trigger mode. Finally send trigger data.

6.2.4

SCPI (Standard Commands for Programmable

Instruments)

SCPI is a new general command based on the IEEE488.2-1987 standard. (SCPI is the same as TMSL, a system language for measurement testers adopted by HP.)

System for Component X System for Component Y

BUS

Relative information for measurement tester

Common commands and query

Syntax and data structure

Remote control

D C B A A B C D

IEEE488.1 Standard IEEE488.1 Standard IEEE488.1 Standard

SCPI SCPI

Where ： Level D shows the instrument functions

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