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DP-M Series User's Manual

Version 12.11.2021

Communication Protocol for DSC-Electronics DP-M Series power supplies

Interface: RS-232 / RS-485

Command format: Asynchronous, 1 start bit, 8 data bits, 1 stop bit

Baud rate: 1200; 2400; 4800; 9600; 14400; 19200; 38400; 43000; 57600; 115200; default at 9600

Communication mode: Master-Slave mode

Controller respond time:

Command Format

1st part: ID number of the DC power supply, 1-16 (If the ID number is 0, all devices will respond)

2nd part: Control command

3rd part: Data length (how many values are supplied to the device in this command)

Data part: 16-bit data, high bit in the front

CRC part: MODBUS format, low byte in the front

Feedback Command Format

1st part: ID number of the DC power supply, 1-16

2nd part: control command

3rd part: data length (how many values are supplied to the device in this command)

Data part: 16-bit data, high bit in the front

CRC check: MODBUS format, low byte in the front

Note: The power supply automatically switches to remote operation mode as soon as contacted through one of the

digital interfaces.

7. Command Examples

7.1 Output ON/OFF

Control command:

Function Code

Feedback: Equal to command.

7.2 Read Output Status

Control command:

Function Code

Feedback:

Function Code

7.3 Read Output Voltage Value

Control command:

Function Code

Feedback:

Function Code

Voltage: 0x0283 in decimal equals to 643.

643 divided by 10 (1 decimal point) is 64.3, thus a voltage value of 64.3V.

0085

Address of Start Register

0085

Address of First Register

0064

Bytes

DSC-Electronics Germany • Georgstraße 36 • 53111 Bonn

Data (On/Off)

FF00

0000

Numbers of Registers

0001

Output Status (On/Off)

Numbers of Registers

0001

Output Voltage

0283

CRC Check Code

9DD3

DC23

CRC Check Code

EC23

CRC Check Code

9048

5188

CRC Check Code

7015

CRC Check Code

F9F1