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Using the Modbus Ports
870 USE 101 00 V.3 105
Modbus Port 1, Continued
Default
Parameters
The factory-set default communication parameters for Modbus Port 1 are:
● 9600 baud
● EVEN parity
● 8-bit RTU mode
● 1 stop bit
● Modbus address
A Processor Adapter cannot support more than one stop bit. If you change this
default setting in the configuration software, the Processor Adapter will ignore the
change.
All other port parameters can be successfully modified in the configuration
software.
Auto-Logout
Feature
If a programming panel is logged into the CPU via the RS232 serial port and its
cable gets disconnected, the CPU automatically logs out the port. This auto-logout
feature is designed to prevent a lock-up situation that could prevent other host
stations from logging in on other ports.