KROHNE Summit 8800 Vol 3 - Manual (Page 132)

132 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol3 R02 en
SUMMIT 8800 COMMUNICATION 08
In the Summit, the modbus slave is completely configurable and can be setup to include any
Summit information in any of the modbus registers. This means that the Summit is capable to
adapt itself to match any of the host devices.
Note: As modbus is not a well defined standard, familiarity with communication and the Mod-
bus protocol is assumed on the part of the user. For further information on modbus please see
website: http://www.simplymodbus.ca or http://en.wikipedia.org/wiki/Modbus
8 .4 .1 Modbus slave port selection and settings
The modbus slave settings are divided in 4 parts: the port settings, the timeout setting, the log
settings and the register settings.
8 .4 .1 .1 Modbus slave port settings
In Hardware select the desired board and port from the left hand list and with modbus slave:
Figure 178 Example RS232/485 Modbus serial and TCP/IP port settings
Settings are needed to match the port with the master device it is intended to be used with.
Please consult master device user manual for further details.
For a serial port set the following parameters:
Modbus ID The modbus identifier for this link (1..255). When multiple SUMMIT’s are sharing one
RS485 link in a multi-drop configuration, each SUMMIT will need a unique identification.
Setup Name Any descriptive name to identify communication port
Protocol ASCII, RTU or RMG. RTU is regarded as the most efficient protocol.
Baud rate The speed of transmission in bits per second between 300 and 38400.
Parity A check on correct transmission: none, odd, even, space or mark.
Stop bits Gap between two transmitted words, 1 or 2 stop bits
Mode RS232 or RS 485
Word size Size of one word: 7 or 8 bits