The MODBUS protocol is a general communication protocol that has been widely used in today's industrial control field.
It is the industry standard for communication protocols in the industrial field, and it is also a commonly used connection method between electronic devices.Currently, the communication protocols for APM power/load products include the SCPI communication protocol and the MODBUS communication protocol (modified according to the MODBUS RTU standard). Remote control can achieve by sending commands in a specified format based on the corresponding register address.
Function codes: 03 for reading holding registers, 06 for writing a single register, and 10 for writing multiple registers.
The MODBUS communication protocol for the following four platforms can control via debugging tools or through the customer's testing system.
SP-1U/2U Series MODBUS Communication Protocol sample
Register Description:
Example: Set voltage to 15V: 0110 0004 0002 0400 0249 F0 AAAA
Set current to 20A: 0110 0005 0002 0400 030D 40 AAAA
Turn on output: 0110 0003 0002 0400 0000 01 AAAA
Turn off output: 0100 0003 0002 0400 0000 00 AAAA
SP-3U/6U Series MODBUS Communication Protocol Example
Register Description:
Example:Setting voltage to 10V: 0110 014E 0002 0400 0027 10 AAAA
Setting current to 30A: 0110 0150 0002 0400 0075 30 AAAA
Enabling output: 0110 012C 0001 0208 00 AAAA
Disabling output: 0110 012C 0001 0200 00 AAAA
SP-300 Series MODBUS Communication Protocol sample Register Description
RMS output voltage:
Output frequency
Outputconfiguration
Set RMS voltage to 110V: 0110 0148 0001 0204 4C AAAA
Set output frequency to 1000Hz: 0110 014A 0002 0400 0186 A0 AAAA
Turn on output: 0110 0120 0001 0210 00 AAAA
Turn off output: 0110 0120 0001 0208 00 AAAA
EL Series MODBUS Communication Protocol Example
Register Description:
Establish remote control: 0110 007C 0001 0201 10 AAAA
Exit remote control: 0110 007C 0001 0200 10 AAAA
Enter CC mode - low range: 0110 02C0 0001 0200 00 AAAA
Enter CC mode - medium range: 0110 02C0 0001 0200 01 AAAA
Enter CC mode - high range: 0110 02C0 0001 0200 02 AAAA
Set current A value to 100A: 0110 02F0 0002 0400 0F42 40 AAAA
Turn on DC input: 0110 02C1 0001 0200 01 AAAA Turn off DC input: 0110 02C1 0001 0200 00 AAAA