APM series Product Sharing on Remote Control through MODBUS Communication

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