PN 305200901, Rev YT
Analyzer Modbus Interface Parameters
A number of analyzer Modbus interface parameters need to be set up in order
to establish communication with the Modbus master. These parameters are
accessed via the service port on the analyzer using a service program running
on a PC.
Modbus Address
The analyzer needs to be assigned a Modbus slave address, which can be a
number from 1–247 with zero (‘0’) interpreted as a broadcast address (that
analyzer will execute the command but will not send a respond back to the
Modbus master).
Communication Parameters
The number of Data Bits is always eight (8); the Baud Rate is 9600 or 19200, the
number of Stop Bits, and the Parity of the analyzer Modbus Serial commu-
nication port are software selectable. The default communication parameter
settings are 9600 baud, one Stop Bit, and Even parity. A variable called Parity-
AndStop located in holding register ‘31’ with Modbus slave address of 4032
determines the port settings.
Power should be cycled O-On or a reset command should be issued to acti-
vate the Slave Address or Parity and Stop Bit change. The Baud Rate change
will take eect immediately.
Value Stop Bits Parity
0 1 NONE
1 2 NONE
2 1 EVEN
Serial Communication Interface | 6-3
To Next Page
Loading...
Need help?
General
