Option Adapters

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.

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.

 

 

 

 

 

 

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.

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.

Auto-LogoutIf the RS232 port is chosen, auto-logout is supported. If a programming panel is

Feature On logged into the CPU via the serial port and its cable gets disconnected, the

Modbus Port 2 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.

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870 USE 101 10 V.2

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