Chapter 4 Management via the CM-2 Module

LRS-24Installation and Operation Manual

 

 

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.

Preliminary Configuration Activities

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

4-4 Introduction

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