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Accutech Modbus Register Mapping

Modbus RTU protocol is supported on the BR10 and BR20 Base Radios. Transmission rates of 9600, 19200, 38400, 57600, 115200 are supported with even, odd or no parity, 8 data bits and 1 or 2 stop bits. The Modbus settings are configured by using the push buttons on the base radio only. The BR10 contains 1 RS-485 port for Modbus communications. The BR20 contains 1 RJ45 connection called the "Short Haul Data" port. This port can be configured for 2-wire RS-485 or 3-wire RS-232 by a dipswich next to the serial port.

The following menu items are used to configure Modbus in the base radio via the push buttons. For a complete menu map of all Accutech Instruments, please reference the Accutech Wireless User Manual that is installed along with Accutech Manager Software an your PC.

BAUD RT - Baud Rate
DEV ID - Modbus Device ID
PARITY - Parity
STOPB - Stob bit selection
MODMAP - Register mapping options (see below)
MODADR - Modbus address of base radio
ORDER - Floating point word order

There are two user options to determine Modbus mapping in the base radio/field units. The MODMAP configuration determines if the mapping will be DEV mode (Device ID) or REG mode (Register)

Device ID Mode

  • Poll for individual devices (Base Radio and Field Units)
  • Modbus Station ID = Base Radio Modbus Station Address + Field Unit RF ID
  • Modbus starting register = 40001

Register Mode

  • Poll single Modbus station ID for complete Accutech network
  • Modbus Station ID = Base Radio Modbus Station Address
  • Field unit Modbus address are multiples of their RF ID
  • Modbus starting register = (Field Unit RF ID * 10) + 40001

Base Radio Registers

Base Radio Holding Register (Device and Register Mapping Modes)

Device ID: 1 To 247 Max.

Address

Description

Register Type

40001

Base Radio Device Type

16-Bit Unsigned Integer

40002

Base Radio Device Status

16-Bit Unsigned Integer

40003

Number of Field Units Expected on the wireless network.

16-Bit Unsigned Integer

40004

Number of Field Units actually online in the wireless network.

16-Bit Unsigned Integer

40005

Online/Offline Status Of Field Units with RFIDs 1-16

16-Bit Unsigned Integer

40006

Online/Offline Status Of Field Units with RFIDs 17-32

16-Bit Unsigned Integer

40007

Online/Offline Status Of Field Units with RFIDs 33-48

16-Bit Unsigned Integer

40008

Online/Offline Status Of Field Units with RFIDs 49-50

16-Bit Unsigned Integer

40009

Diagnostic Counter (increments each second)