UNI-T LCR-1000 series Operation Manual page 27

AH1 Receiver communication
T5 Speak function
L4 Listen function
SR1 Service request
RL1 Remote/local switch
DC1 Reset instrument
DT1 Trigger instrument
C0 Control function
5-3-1. GPIB Address
GPIB address can be set between numbers from 0 to 31. Please refer to [SYSTEM] menu for details of
interface setup.
5-3-2. GPIB Bus Function
Commands
AORT I/O (IFC)
CLEAR LOCKOUT/
SET LOCAL
DEVICE CLEAR
(SDC or DCL)
LOCAL LOCKOUT (LLO)
REMOTE
SPOLL
SERVICE REQUEST
TRIGGER (GET)
5-4. USB HOST
The USB HOST can be used to control the LCR meter It is in compliance with USMTMC-USB488 and USB2.0
Three line connection
Send instrument information
Receive instrument information
Demand service
Switch between remote control and local control
Send CLEAR signal
Send trigger signal
Send control signal
Description
Stop all bus actions. Stop receiving instrument's data. Reset the interface to
idle state.
Prepare the instrument for remote control.
Clear the selected instrument, or clear all instruments.
Lock local commands. Carry out this command.
Set the instrument to remote control mode.
This is Serial naming command, which is used to configure the bus address
status byte. 8 bytes are used to mask and read to determine the operating
status of the instrument.
When the series instrument requests the controller to perform a task, the
instrument will send SRQ (service request) signal. SRQ signal is considered as
an interrupt that tells the controller to be prepared for data transmission or there
is an error condition. When the series instrument sends the SRQ service
request signal, it also sets the status byte to 6 bits. The 6 bits are RQS request
service bits, sometimes as a status bit when concatenated with the naming
command. When the series instrument serializes, it clears the RQS (Request
Service) bit and the SRQ line. Each byte of the status byte initiates an SRQ
service request. The user can mask the status byte to determine which one
caused the series instrument to set the SRQ line. See "Status Bytes" for details.
Trigger bus commands. This command can be sent to the selected instrument
or all the instruments as the listener. The series instruments must first be
assigned to the listener and then set the bus trigger mode to trigger mode before
sending the trigger message