RAD Data comm LRS-24 Management Priorities, Preliminary Configuration Activities

Chapter 4 Management via the CM-2 Module LRS-24 Installation and Operation Manual

4-4 Introduction

The CM-2 module also includes the functions required to handle the exchange of

management communication with a supervision terminal connected to the serial

port of the CM-2 module. The supervision terminal addresses a specific module by

specifying its node number. The node number is actually the number of the

LRS-24 physical slot in which the module is installed (1 through 12 for user

I/O modules, 13 for the CM-2 module itself).

For each message, the CM-2 module uses its terminal interfacing functions to read

the node number, and then processes the message according to the capabilities of

the addressed module.

The processing is as follows: a proprietary protocol is used for the internal

communication. Therefore, the CM-2 module uses its terminal interfacing function

to convert any message to the proprietary protocol, and route it to the addressed

module. This conversion also ensures that the user always sees a consistent

interface.

When a link to a remote module connected to a module installed in LRS-24 is set

up, the CM-2 module also enables the management function to access the remote

module. The available remote management capabilities depend on module

characteristics (see the relevant module Installation and Operation Manual).

Management Priorities

The CM-2 module is designed to give the highest priority to SNMP-based

management. Therefore, when the CM-2 module is connected to an SNMP-based

management station through the dedicated management interface, the serial

supervisory port cannot be used for management unless the network management

station operator specifically transfers the management to the supervisory port. The

serial port can, however, be used at any time for reading the module configuration

and status.

The supervisory port is also automatically enabled in case the management station

is not active, however, when the station becomes active it automatically takes

control and disables management through the serial port.

If neither the network management station nor the terminal is active, the CM-2

module can also read configuration parameters from the remote module in a link

with a local module.

The CM-2 module, as well as other modules installed in LRS-24, requires

preliminary configuration. Preliminary configuration is performed using an ASCII

terminal connected to the CM-2 serial supervisory port. The serial port

characteristics are as follows:

Default data rate: 38.4 kbps

Default word format: 1 start bit, 8 data bits, no parity, 1 stop bit

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