Samson SAM HOME, Mounting And Operating Instructions

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3-4 EB 5660 EN
Design and principle of operation
3.2 Functions
Revisions and new firmware versions are created to include new functions. A summary of the
revisions is included in the 'Markings on the device' section.
3.3 Modbus TCP communication
Basic function
All the SAM gateways (including SAM HOME and SAM MOBILE) have a new function to
forward requests over Modbus TCP in addition to the usual communication based on the
request and response method from Modbus TCP to Modbus RTU.
The added function makes it possible to directly connect Modbus TCP devices to the gateway
and communicate with them. This makes the following actions possible:
1. Response over internal Modbus slaves
2. Forwarding to another Modbus TCP server
3. Forwarding to Modbus RTU interfaces (UARTs) of the gateway
Modbus topology
The gateway can receive two types of TCP-based interface requests:
1. Modbus TCP server
2. SAM DISTRICT ENERGY web interface (including push mode)