MS33 series 485 Communication Series Barometer Wiring Definition and MODBUS Protocol

Product catalog summary

Overview: This document provides technical specifications and instructions for a pressure gauge using MODBUS protocol. It includes wiring instructions, communication settings, and command examples for operation.

Specifications:

Power Supply: Brown (12~24VDC), Blue (0V)
Communication: White (485A D+), Orange (485B D-)
Digital Output: Black
Default Baud Rate: 19200, with 1 start bit, 8 data bits, 2 stop bits, and no parity bit
Address Range: 1 to 247, default 18 (hexadecimal 12H)

MODBUS Functions:

03H: Read Multiple Registers
06H: Write Single Register
10H: Write Multiple Registers
04H: Read Air Pressure Value

Configuration Instructions:

To change the address, press the MODE key for 2 seconds to enter the MENU, navigate to Addr, and adjust using up/down keys.
To change the baud rate, enter the MENU, navigate to BAUD, and adjust with options 9600, 19200, 38400, 115200.
To adjust stop bits, enter the MENU, navigate to SBit, and choose between 1 and 2.
To set parity, enter the MENU, navigate to EOCH, and select NONE, ODD, or EVEN.

Register Descriptions:

Pressure Value: 10ms update, follows screen display
OUT Target Values: Upper and lower limits, output mode
Display Color Settings
Unit Settings: MPa, kPa, KGF, BAR, PSI
Reset and Normally Open/Closed Settings

Command Examples:

03H Command: Host sends and pressure switch returns data
06H Command: Host sends and pressure switch returns data
10H Command: Host sends and pressure switch returns data
04H Command: Host sends and pressure switch returns data

Catalog excerpts

MS33 series 485 Communication Series Barometer Wiring Definition and MODBUS Protocol-1

485CommunicationPressureGague MODBUSProtocolAndWiringInstructions Brown12~24VDCBlue :0V White 485A D+ Orange 485B D-BlackDigitalswitchingoutput Data CRC Address Funtion DataFormat 8bit 8bit n*2*8 bit 16bit SingleFrame Thedefaultbaudrateis19200,with1startbit,8databits,2stopbits,andnoparitybit. TheaddressofPressureGaguecanbeadjustedfrom1to247,withadefaultvalueof18(hexadecimal12H). Format FunctionCode RegisterAddressDescription: Corresponding Pressurevalue (Followscreendisplay) Normallyopenand normallyclosed settingvalue Read /write PressureSwitch Ontologysettings - 101.0kPa~out1_up_value 0~2 Correspondingto EASY,HYS,WCMP 0~3 Correspondingto R_ON,G_ON,RED,GREEN LO - 1 MENUmode: OUT1 MENUmode: COLO UNIT MENUmode: no.nc Longpressthe upanddownkeys for3seconds

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MS33 series 485 Communication Series Barometer Wiring Definition and MODBUS Protocol-2

03HCommandExample Hostsend DriveAddress FunctionCode High-order Low-order High-order Low-order Low-order High-order Pressureswitchreturn DriveAddress 12H FunctionCode 03H DataQuantity 04H High-order 00H Data1 Low-order 00H High-order 00H Data2 Low-order 00H Low-order D8H CRC High-order F2H High-order Low-order High-order Low-order Low-order High-order Pressureswitchreturn DriveAddress 12H FunctionCode 04H DataQuantity 02H High-order 00H Data1 Low-order 00H Low-order 3CH CRC High-order F3H High-order Low-order High-order Low-order Low-order High-order Pressureswitchreturn DriveAddress 12H FunctionCode...

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