WirelessHART Fieldgate SWG70 Modbus Interface
Endress + Hauser 115
Modbus overview
16.1.2 Modbus in Fieldgate
Fieldgate SWG70 is equipped with both a Modbus serial and Ethernet interface. As a result,
it can be operated in one of the following roles:
• Modbus Serial Slave
• Modbus TCP Slave
A serial or TCP slave can be accessed by one Modbus master only.
Establishing
communication
As a TCP slave, Fieldgate SWG70 will normally communicate with the master via Port 502.
If this port is unavailable, it is possible to specify a secondary TCP/IP port number.
Modbus commands Fieldgate SWG70 support for Modbus functions is currently as follows:
Modbus RTU Modbus TCP
Standard compliance "Modbus over Serial Line" V1 "Modbus over TCP" V1
Physical layer RS-485 Ethernet
Transmission mode RTU (binary mode) TCP
Baudrates 1200 bit/s, 2400 bit/s, 4800 bit/s,
9600 bit/s, 19200 bit/s, 38400 bit/s,
57600 bit/s, 115200 bit/s
100 MBit/s
Parity Odd, Even, None –
Stop bits 1; 1.5; 2 –
Polling address 1...247 –
Port No. – 502
Capabilities • Input registers starting at Modbus address 30013
• HART Command 3 dynamic variables mapped into input registers
• 2 input registers map a single HART dynamic variable
• 32bit HART floating point format used
• Status information mapped on dedicated input registers
Function Function Code Hex Function supported
Read discrete inputs 2 0x02 Yes
Read coils 1 0x01 No
Write single coil 5 0x05 No
Write multiple coils 15 0x0F No
Read input register 4 0x04 Yes
Read holding register 3 0x03 Yes
Write single register 6 0x06 No
Write multiple registers 16 0x10 No
Read/Write multiple register 23 0x17 No
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