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Option Adapters
870 USE 101 00 V.3 59
Front Panel Components, Continued
LED Indicator This Option Adapter has one LED indicator, the Com Act indicator. Its functions
are described in the table below.
Modbus Port 2 Modbus Port 2 is a general-purpose asynchronous serial port with user-selectable
RS232/RS485 slave functionality. The choice between RS232 and RS485 is made
in the software.
Auto-Logout
Feature On
Modbus Port 2
If the RS232 port is chosen, auto-logout is supported. If a programming panel is
logged into the CPU via the serial port and its cable gets disconnected, the
Processor Adapter 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.
Auto-logout is not available for any RS485 port, including the RS485 option on the
Serial Option Adapter. The user must log out of the processor using the
programming software.
Continued on next page
LED Status Function
COM ACT Green May be on steadily or blinking. Indicates activity on the RS232/
RS485 serial port.
Off No activity on the RS232/RS485 serial port.
Note: When this Option Adapter is assembled with a 171 CCS 780 00
Processor Adapter or a 171 CCC 780 10 Processor Adapter (with built-in
Modbus Port 2), the Modbus Port 2 on the Option Adapter is electrically
disabled. The TOD clock and the battery backup on the Option Adapter
remain functional.