SSD Series – Riedon™ Digital Current Sensor with RS485/MODBUS Interface by Bourns

Specifications are subject to change without notice.

Users should verify actual device performance in their specific applications.

The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.

SSD Interface Manual (continued)

MODBUS RTU

The following two tables show the locations of the SSD Input and Holding Registers.

See the standard RS485 commands for detailed descriptions of each register.

Modbus Poll files are available for easy setup as shown below.

MODBUS Input Registers

0

Current

0

1

–

2

Temperature

0

3

–

4

Bus Voltage

0

5

–

6

Charge

0

7

–

8

–

9

–

10

Power

0

11

–

12

Energy

0

13

–

14

–

15

–

16

Errors

0000 0000 0000 0000

17

Firmware Version

0x0204

18

Serial Number

1234

19

–

20

Restart Causes

0x0000

MODBUS Holding Registers

0

RESET (Write Only)

0x0000

1

ADDRESS

1

2

SETMODE

0x0006

3

A2D CONFIG

0x335C

4

BAUD RATE

3

5

Read Delay (ms)

1000

6

Current Under Limit (A)

0

7

Current Over Limit (A)

0

8

Temperature Over Limit (°C)

125

9

VBUS Under Limit (V)

0

10

VBUS Over Limit (V)

0

11

Power Over Limit (W)

0

12

–

13

Shunt Nano-Ohms

120000

14

–

15

Current Offset (mA)

0

16

Vbus Factor

10000

17

Vbus Offset (mV)

0

18

Temp Offset (0.1 °C)

0

19

TC0

50000

20

TC1

0

21

–

22

TC2

0

23

–

24

Reserved

0

25

–

MODBUS registers larger than 16 bits have a little-endian byte

swap format.

The sensor does not respond to broadcast messages on

address Ø.

NOTE: No settings are saved until a save settings to EEPROM command is issued!

Power cycling will restore previous settings. Write 0x0F to Holding Register 0.