RAD Data comm LRS-24 - Manual (Page 68)

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.
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
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