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CHAPTER 3: SELECT CONTROL METHOD
3.1
A Variety of Control Methods
The power supply with MODBUS TCP interface is very flexible. In addition to the MODBUS TCP
interface, there are other ways the supply can be used.
Refer to USER MANUAL (IA761-04-02_) for more details on the local operation mode (Front Panel), Serial
operation mode (RS232/485 or USB), LAN operation mode (Ethernet) or Analog (Via J1, DB26HD).
3.2
MODBUS TCP, LAN, LOCAL, Serial or Analog Control
The power supply, with MODBUS TCP interface option installed, may be operated through five
interfaces. This section describes how to enable each.
MODE MODE DESCRIPTION
1 MODBUS
TCP
Control using Ethernet connection
by MODBUS TCP registers
MODBUS TCP disables serial and
LAN communication ports
2 LAN Control using Ethernet connection
by SCPI commands
MODBUS TCP is disabled if LAN is
selected
3 Local Control using the front panel
buttons and encoders
MODBUS TCP can be used to
monitor while in local mode
4 Serial Control using RS232/485 or USB MODBUS TCP is disabled if Serial
is selected
5 Analog Control using analog signals to the
26 pin ‘J1’ DB26HD connector
MODBUS TCP, LAN, Local or
Serial can be used to monitor and
set protections
3.2.1 Select Local (Front Panel) Mode
The supply may be operated in the local (or front panel) mode, even when a computer is using the MODBUS
TCP connection.
If the supply is in remote mode, the front panel REM indicator is ON. The supply may be returned to local by
pressing SYST / Lock Front Panel Button and acknowledged by clicking the Current Encoder Button.
If the power supply does not switch into local mode, then:
• If a MODBUS TCP program is running to change power supply settings/parameters, it will
automatically go to remote with every command. Stop MODBUS TCP program and the
n return
the supply to local mode
by pressing SYST / Lock Front Panel Button and acknowledge by
clicking the Current Encoder Button.
• The supply may be set to Local Lockout. Use MODBUS TCP Register 1006 to read or write
power supply remote state, or turn the supply AC off and back on, and then press SYST / Lock
Front Panel Button and acknowledge by clicking the Current Encoder Button.
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