DS 400 Side 6 of 36
3 Technical data DS 400
3.1 DS400 MODBUS RTU specification
Device type Slave
Baud Rates 1200,2400, 4800, 9600, 19200, 38400 bps
Device address range 1...247
Electrical Interface RS485, 2 wire (Internal Connector X4.1)
Protocol RTU
Supported function code 3 read holding register
16 write multiple register
Broadcast No
Standard Modbus over serial line V1.02
3.2 DS400 MODBUS/ TCP specification
Device type Slave
Device address range 1...247
Electrical Interface Ethernet, RJ45
Protocol MODBUS/TCP
IP address Obtained from DHCP or static
Port 502
Supported function code 3 read holding register
16 write multiple register
Standard Modbus Messaging on TCP/IP Implementation Guide V1.0b
3.3 General Modbus Information
The DS 400 Modbus module complies with the Modbus serial line protocol [Reference 1].
Among other things this implies a master-slave protocol at level 2 of the OSI model. One
node (the master) issues explicit commands to one of the ,,sIave"-nodes and processes
responses. Slave nodes will not transmit data without a request from the master node, and
do not communicate with other slaves.
Modbus is a mono master system, which means that only one master can be connected
at the time.
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