Banner DXMR90-X1 Series, Instruction Manual

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May 09, 2023
DXMR90-X1 Series Controller Instruction Manual
25
Assigning Modbus Slave IDs ............................................................................................................................................................................ 25
Modbus Operation ............................................................................................................................................................................................ 26
Modbus Communication Timeouts ................................................................................................................................................................... 26
Modbus TCP Client .......................................................................................................................................................................................... 26
The DXMR90-X1 has five physical RS-485 connections using Modbus RTU protocol.
The master Modbus RS-485 ports are for the DXMR90-X1 to act as a Modbus master device to control external Modbus
slave devices.
The Modbus master RS-485 ports are labeled Port 1–4. The Modbus slave port is used when another Modbus master device
wants to communicate with the
DXMR90-X1 when the DXMR90-X1 is a Modbus slave device.
The Modbus slave RS-485 port is labeled Port 0.
DXMR90-X1 system overview
Processor/Outputs (Base Board)
Ethernet
RS-485 (master)
RS-485 (slave)
Local Registers
(Modbus ID 199) Outputs (Modbus ID 203) Processor Controlled
Output (LEDs)
Local Registers
Integer
Local Registers
Float
The DXMR90-X1 has dual Modbus roles: a Modbus slave device and a Modbus master device. These run as separate
processes.
The Modbus slave port can only access the DXMR90-X1 local registers. To operate as a Modbus slave device, the DXMR90-
X1 needs to be assigned a unique Modbus slave ID as it pertains to the host Modbus network. This slave ID is separate from
the internal Modbus slave IDs the DXMR90-X1 uses for its own Modbus network. The DXM Modbus slave ID and other Mod-
bus slave port parameters are defined by using the configuration software.
The DXMR90-X1 operates the Modbus master ports. Each device on a master port must be assigned a unique slave ID.
There are slave IDs that are reserved for internal devices in the DXMR90-X1. Each device that shares a master port must
have a unique ID. Devices on separate ports may have the same ID.
Internal Modbus slave IDs (factory default)
Modbus Slave ID Device
199 Local Registers—Internal storage registers
203 LED indicators
Assigning Modbus Slave IDs
Assign the DXM Modbus Slave ID only if a Modbus master device is reading or writing the DXM Local Register data through
the Modbus RS-485 slave port 0.
To set the Modbus Slave parameters for Port 0, go to Settings › System › Slave Port 0 settings. Here you can modify
the Baud Rate , Parity , and change the Internal Slave ID . The Internal Slave ID is the Modbus ID that an external Modbus
Master accesses to read/write to the local registers on the DXMR90-X1 .
DXM Master Configuration —When the DXM operates as a Modbus master device, use the configuration software to config-
ure read or write operations of the DXM Modbus network. The DXM communicates with all internal and external peripheral
devices using the external Modbus bus RS-485 port(s).
Working with Modbus Devices
Chapter 4
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