MSENSE
®
DGA 9 7045899/02 EN – 11.2020 Page 121
6.10.4.5.3.3 MODBUS
The connection of several MSENSE® DGA 9s to a control system can be realised with MODBUS. A
connection to the MSET DGA is not possible via MODBUS.
MODBUS configuration
Using the Enter key, the following selection can be made in the field mode:
Settings MODBUS configuration in MSENSE
®
DGA 9:
• Mode
o RS485 RTU
o RS485 ASCII
o RS232 RTU (for service purposes only)
o RS232 ASCII (for service purposes only)
• Address
The device address is entered in the address field. For the MODBUS communication, addresses
in the range of 1 ... 247 are permissible. For the MSENSE DGA protocol, addresses in the range
of 1 ... 254 will be issued.
Remark: There can currently be up to 32 devices in the same RS485 bus.
• Baud rate, data bits, parity and stop bits
o Setting the baud rate (2400, 4800, 9600, 19200, 38400, 57600 or 115200))
o The format coding of the serial MODBUS protocol can be set with these input fields:
▪ Set data (7 or 8)
▪ Set parity (none, odd or even)
▪ Set stop bits (1 or 2)
Remark:
• Changing the mode does not automatically adjust the format coding. The format coding must
be entered manually according to the mode.
• Only the baud rate setting is used for the MSENSE DGA protocol. The remaining format coding
settings are ignored and the fixed values (8 data bits / no parity / 1 stop bit) are adopted.
• Response delay
Should communication problems occur, a response delay (0 ... 2550 ms) can solve the problem in
most instances.
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