Yokogawa RotaMASS 3-Series - Manual (Page 16)

IM 01R04B08-00E-E 1st edition February 15, 2012 -00 All Rights Reserved. Copyright © 2012, Rota Yokogawa
<4. GETTING STARTED>
4-2
4.2 Communication Setting
To activate MODBUS, the following settings are required. They are located in the MODBUS Communication
menu in Detailed Setup.
Do not turn off the power supply immediately after setting. When the parameters are saved to the EEPROM,
the redundant processing is executed for the improvement of reliability. If the power is turned off within 60
seconds after setting is made, the modified parameters are not saved and the settings may return to the
previous values.
Table 4.1 Communication Parameters
Function Parameter Description and Setting
Device address Device address Select: 1 to 247
Set the device address for ROTAMASS where the
host expects to communicate. Make sure that no other
device on the bus uses the same address!
Baud rate Baud rate Select: 1200, 2400, 4800, 9600, 19200, 38400, 57600,
76800, 115200
Make sure that host and ROTAMASS use the same
baud rate for communication
Communication
settings Data format Select: Even 1 stop bit, Odd 1 stop bit, None 1 stop
bit, None 2 stop bits
Make sure that host and ROTAMASS use the same
communication settings.
Bus mode Modbus mode Select: RTU, ASCII
Make sure that host and ROTAMASS communicate in
the same Modbus mode.
Modbus init
IMPORTANT
The MODBUS communication module must be
restarted after changing any of the above settings!
This can be done by either powering off and on the
device or by executing the function “Modbus init”.
Please note that the settings in the menu will
be updated after initialization of the Modbus
communication module.
IMPORTANT
Connecting the ROTAMASS MODBUS communication tool to a bus with its existing host may cause
communication data scrambles resulting in a functional disorder or a system failure.
IMPORTANT