Cirrus-logic CobraNet User Manual download pdf (Page 28)

CobraNet Programmer’s Reference

Management Interface Variable Reference

6. Management Interface Variable Reference

CobraNet interfaces are configured and monitored by reading and writing Management

Interface variables. MI variables may be accessed directly via a processor attached to the

Host Management Interface or via the network using SNMP. The method of using the HMI

is similar for all CobraNet interfaces but may require specific semantics and may have

different word sizes depending on the actual implementation. The HMI interface is

described in more detail in the Hardware Reference Manual applicable to the particular

CobraNet Interface. Following are detailed descriptions of the size, contents, and effects

of the MI variables as well as their HMI addresses and SNMP Object Identifier numbers.

All MI variables can be accessed via the HMI but some variable properties render them

inappropriate for accessing via SNMP. These exceptions are noted in the variable

descriptions where applicable.

6.1 Legend

Name - Name of variable as seen in CobraNet MIB and cobrami.h header file.

Description - Description of the variable including allowed values and usage discussion.

Host Address - HMI addresses are used to access variables via the host port. HMI

addresses have a 24-bit range on both 24- and 32-bit platforms.

SNMP Object ID (OID)- The Object Identifier is the numeric name assigned to a variable

according to the SNMP protocol.

Size - Size is indicated for varying-length data types such as DisplayString and OID. Size

is not indicated for fixed types whose size is implied by their data type. Note that for fixed

types, the word size may differ depending on the processor type.

Count - Number of entries for array or buffer-type variables. Absence of a Count

specification implies a single instance variable, and thus a Count of 1.

Type - Data type of the variable. The options and format of data types are described

below in detail.

Attributes - Read-only variables can only be read and can not be modified. Read/Write

variables can be read and written. Read/Write - Persistent variables can be read and

written. If the persistence feature is enabled, values of these variables will automatically

be written to flash for recall at startup.

Default - Value assigned to the variable at startup when persistence is disabled. The

values of some Read-only variables reflect system conditions and thus may not have a

default value.

Version - Firmware version in which the variable was first introduced. Unless otherwise

noted in this field, one can assume variables will be available in the version indicated and

all subsequent versions.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 146 147

No comments

Cirrus-logic CobraNet User Manual Page 28