SONBEST SM1635B-1 RS485 Current Acquisition Transmitter User Manual
- June 5, 2024
- SONBEST
Table of Contents
SONBEST SM1635B-1 RS485 Current Acquisition Transmitter
SM1635B-1 using the standard RS485 bus MODBUS-RTU protocol ,easy access to
PLC，DCS and other instruments or systems for monitoring 4-20MAcurrent state
quantities. The internal use of high-precision sensing core and related
devices to ensure high reliability and excellent long-term stability ,can be
customized RS232,RS485,CAN,4-20mA,DC0~5V\10V,ZIGBEE,Lora,WIFI,GPRS and other
output methods.
Technical Parameters
| Technical parameter | Parameter value |
|---|---|
| Brand | SONBEST |
| --- | --- |
| Communication Interface | RS485 |
| Default baud rate | 9600 8 n 1 |
| Power | DC9~24V 1A |
Wiring instructions
Any incorrect wiring can cause irreversible damage to the product. Please carefully wire the cable as follows in the case of power failure, and then connect the cable to confirm the correctness and then use it again.
| ID | Core color | Identification | Note |
|---|---|---|---|
| 1 | Red | V+ | Power + |
| 2 | Green | V- | Power – |
| 3 | Yellow | A+ | RS485 A+ |
| 4 | Blue | B- | RS485 B- |
In the case of broken wires, wire the wires as shown in the figure. If the product itself has no leads, the core color is for reference.
Communication Protocol
The product uses RS485 MODBUS-RTU standard protocol format, all operation or reply commands are hexadecimal data. The default device address is 1 when the device is shipped, the default baud rate is 9600, 8, n, 1
Read Data (Function id 0x03)
Inquiry frame (hexadecimal), sending example: Query 1# device 1 data, the host computer sends the command:01 03 00 00 00 01 84 0A .
Device ID
| Function id| Start Address| Data Length| CRC16
---|---|---|---|---
01| 03| 00 00| 00 01|
84 0A
For the correct query frame, the device will respond with data:01 03 02 00 79 79 A6 , the response format is parsed as follows:
Device ID
| Function id| Data Length| 数据 1| Check Code
---|---|---|---|---
01| 03| 02| 00 79|
79 A6
Data Description: The data in the command is hexadecimal. Take data 1 as an example. 00 79 is converted to a decimal value of 121. If the data magnification is 100, the actual value is 121/100=1.21. Others and so on.
Data Address Table
Address| Start Address| Description| Data type| Value
range
---|---|---|---|---
40001| 00 00| 1#4-20MAcurrentregister| Read only| 0~65535
40101| 00 64| model code| read/write| 0~65535
40102| 00 65| total points| read/write| 1~20
40103| 00 66| Device ID| read/write| 1~249
40104| 00 67| baud rate| read/write| 0~6
40105| 00 68| mode| read/write| 1~4
40106| 00 69| protocol| read/write| 1~10
Read and modify device address
Read or query device address
If you don’t know the current device address and there is only one device on
the bus, you can use the command FA 03 00 64 00 02 90 5F Query device address.
Device ID
| Function id| Start Address| Data Length| CRC16
---|---|---|---|---
FA| 03| 00 64| 00 02|
90 5F
FA is 250 for the general address. When you don’t know the address, you can
use 250 to get the real device address, 00 64 is the device model register.
For the correct query command, the device will respond, for example the
response data is: 01 03 02 07 12 3A 79, the format of which is as shown in the
following table:
Device ID
| Function id| Start Address| Model Code| CRC16
---|---|---|---|---
01| 03| 02| 55 3C 00 01|
3A 79
Response should be in the data, the first byte 01 indicates that the real
address of the current device is, 55 3C converted to decimal 20182 indicates
that the current device main model is 21820, the last two bytes 00 01
Indicates that the device has a status quantity.
Change device address
For example, if the current device address is 1, we want to change to 02, the
command is:01 06 00 66 00 02 E8 14 .
Device ID
| Function id| Start Address| Destination| CRC16
---|---|---|---|---
01| 06| 00 66| 00 02|
E8 14
After the change is successful, the device will return information: 02 06 00 66 00 02 E8 27 , its format is parsed as shown in the following table:
Device ID
| Function id| Start Address| Destination| CRC16
---|---|---|---|---
01| 06| 00 66| 00 02|
E8 27
Response should be in the data, after the modification is successful, the first byte is the new device address. After the general device address is changed, it will take effect immediately. At this time, the user needs to change the query command of the software at the same time.
Read and Modify Baud Rate
Read baud rate
The device default factory baud rate is 9600. If you need to change it, you
can change it according to the following table and the corresponding
communication protocol. For example, read the current device’s baud rate ID,
the command is:01 03 00 67 00 01 35 D5 , its format is parsed as follows.
Device ID
| Function id| Start Address| Data Length| CRC16
---|---|---|---|---
01| 03| 00 67| 00 01|
35 D5
Read the baud rate encoding of the current device. Baud rate encoding: 1 is
2400; 2 is 4800; 3 is 9600; 4 is 19200; 5 is 38400; 6 is 115200.
For the correct query command, the device will respond, for example the
response data is: 01 03 02 00 03 F8 45, the format of which is as shown in the
following table:
Device ID
| Function id| Data Length| Rate ID| CRC16
---|---|---|---|---
01
| 03| 02| 00 03| F8 45
coded according to baud rate, 03 is 9600, ie the current device has a baud
rate of 9600.
Change the baud rate
For example, changing the baud rate from 9600 to 38400, i.e. changing the code
from 3 to 5, the command is: 01 06 00 67 00 05 F8 1601 03 00 66 00 01 64 15 .
Device ID
| Function id| Start Address| Target Baud Rate| CRC16
---|---|---|---|---
01| 03| 00 66| 00 01|
64 15
Change the baud rate from 9600 to 38400, changing the code from 3 to 5. The new baud rate will take effect immediately, at which point the device will lose its response and the baud rate of the device should be queried accordingly. Modified.
Read Correction Value
Read Correction Value
When there is an error between the data and the reference standard, we can
reduce the display error by adjusting the correction value. The correction
difference can be modified to be plus or minus 1000, t hat is, the value range
is 0-1000 or 64535 -65535. For example, when the display value is too small,
we can correct it by adding 100. The command is: 01 03 00 6B 00 01 F5 D6 . In
the command 100 is hex 0x64 If you need to reduce, you can set a negative
value, such as -100, corresponding to the hexadecimal value of FF 9C, which is
calculated as 100-65535=65435, and then converted to hexadecimal to 0x FF 9C.
The correction value starts from 00 6B. We take the first parameter as an
example. The correction value is read and modified in the same way for
multiple parameters.
Device ID
| Function id| Start Address| Data Length| CRC16
---|---|---|---|---
01
| 03| 00 6B| 00 01|
F5 D6
For the correct query command, the device will respond, for example the response data is: 01 03 02 00 64 B9 AF, the format of which is as shown in the following table:
Device ID
| Function id| Data Length| Data value| CRC16
---|---|---|---|---
01
| 03| 02| 00 64| B9 AF
In the response data, the first byte 01 indicates the real address of the
current device, and 00 6B is the first state quantity correction value
register. If the device has multiple parameters, other parameters operate in
this way. The same, the general temperature, humidity have this parameter, the
light generally does not have this item.
Change correction value
For example, the current state quantity is too small, we want to add 1 to its
true value, and the current value plus 100 correction operation command is:01
06 00 6B 00 64 F9 FD . value plus 100 correction operation command is:01 06 00
6B 00 64 F9 FD .
Device ID
| Function id| Start Address| Destination| CRC16
---|---|---|---|---
01| 06| 00 6B| 00 64|
F9 FD
After the operation is successful, the device will return information: 01 06
00 6B 00 64 F9 FD, the parameters take effect immediately after successful
change.
Disclaimer
This document provides all information about the product, does not grant any
license to intellectual property, does not express or imply, and prohibits any
other means of granting any intellectual property rights, such as the
statement of sales terms and conditions of this product, other issues. No
liability is assumed. Furthermore, our company makes no warranties, express or
implied, regarding the sale and use of this product, including the suitability
for the specific use of the product, the marketability or the infringement
liability for any patent, copyright or other intellectual property rights,
etc. Product specifications and product descriptions may be modified at any
time without notice.
Contact Us
Company: Shanghai Son best Industrial Co., Ltd
Address: Building 8,No.215 North east road, Baoshan District, Shanghai,
China
Web: http://www.sonbest.com
Web: http://www.sonbus.com
SKYPE: soobuu
Email: sale@sonbest.com
References
- Home-上海æœåšå®žä¸šæœ‰é™å…¬å¸
- Home-SONBEST -SONBUS.COM| THE SENSOR COMPANY
- Home-SONBEST -SONBUS.COM| THE SENSOR COMPANY