FAITHTECH
FTB9000 USER MANUAL
66
easy to remember.
Device commands include two types: IEEE488.2 public commands and device-specific
SCPI commands.
IEEE 488.2 Common Commands define some control and query commands common to
instrumentation. You can use common commands to perform basic operations on the device,
such as reset and status query. All IEEE 488.2 public commands consist of "*" and a
three-letter mnemete such as: *RST, *IDN? , * ESE? And so on.
The SCPI command implements most of the test, setup, calibration, and measurement
functions on the device. Such commands are organized as command trees. Each command
can contain multiple mnemics, and the nodes of the command tree are separated by the
character ":", as shown below. The "ROOT" at the top of the command tree is called "root". The
full path from the root to the leaf is a complete programming command.
Photo 4- 5 SCPIcommand tree
For details about the SCPI protocol, refer to the FTB9000 Programming Manual SCPI
Edition.
4.4.2.Modbus protocol
Modbus is a serial communication protocol that was published by Modicon (now
Schneider Electric) in 1979 for communication using programmable logic controllers
(PLC). Modbus has become an industry standard (De facto) for communication protocols
in the industrial field and is the common way to connect industrial electronic devices.
Modbus protocol is a master/slave architecture protocol. One node is the master node,
