EIA/TIA-232 MIB Objects
(RFC 1317)

Note EIA/TIA-232 was known as recommended standard RS-232 before its acceptance as a standard by the Electronic Industries Association (EIA) and Telecommunications Industry Association (TIA). Because RS-232 appears on the out-of-band management screens and in names of supported MIB objects, this manual also uses RS-232.

The Catalyst 2820 and 1900 support the following EIA/TIA-232 groups (RFC 1317):

Generic EIA/TIA-232 group
EIA/TIA-232 general port table
EIA/TIA-232 asynchronous port group
EIA/TIA-232 synchronous port group
Input signal table
Output signal table

The associated MIB objects for these groups are described below.

The Generic EIA/TIA-232 Group

Implementation of this group is mandatory for all systems that have EIA/TIA-232 hardware ports supporting higher level services such as character streams or network interfaces.

rs232Number (integer)

This read-only MIB object displays the number of ports in the EIA/TIA-232-like general port table.

Valid Values: 1

The EIA/TIA-232 General Port Table

rs232PortTable

This MIB object displays a list of port entries. The number of entries is given by the value of rs232Number.

rs232PortEntry

This MIB object displays status and parameter values for a port.

rs232PortIndex (integer)

This read-only MIB object displays a unique value for each port. Its value ranges between 1 and the value of rs232Number.

rs232PortType (integer)

This read-only MIB object displays the port's hardware type.

Valid Values: rs232 (2)

rs232PortInSigNumber (integer)

This read-only MIB object displays the number of input signals for the port in the input signal table (rs232PortInSigTable).

rs232PortOutSigNumber (integer)

This read-only MIB object displays the number of output signals for the port in the output signal table (rs232PortOutSigTable).

rs232PortInSpeed (integer)

This read-write MIB object contains the port's input speed in bits per second (bps).

Valid Values: 300

1200

2400

9600

19200

Default Value: 9600

rs232PortOutSpeed (integer)

This read-write MIB object contains the port's output speed in bits per second.

Valid Values: 300

1200

2400

9600

19200

Default Value: 9600

EIA/TIA-232 Asynchronous Port Group

Implementation of this group is mandatory if the system has any asynchronous ports. Otherwise it is not present.

rs232AsyncPortTable

This read-only MIB object displays a list of asynchronous port entries. The maximum entry number is given by the value of rs232Number. Entries need not exist for synchronous ports.

rs232AsyncPortEntry

This read-only MIB object displays status and parameter values for an asynchronous port.

rs232AsyncPortIndex (integer)

This read-only MIB object displays a unique value for each port. Its value is the same as rs232PortIndex for the port.

rs232AsyncPortBits (integer)

This read-write MIB object contains the port's number of bits in a character.

Valid Values: 7 or 8

rs232AsyncPortStopBits (integer)

This read-write MIB object contains the port's number of stop bits.

Valid Values: one (1)

two (2)

Default Value: one (1)

rs232AsyncPortParity (integer)

This read-write MIB object contains the port's sense of a character parity bit.

Valid Values: none (1)

odd (2)

even (3)

mark (4)

space (5)

Default Value: none (1)

rs232AsyncPortAutobaud (integer)

This read-write MIB object is used to control the port's ability to automatically sense input speed.

When rs232PortAutoBaud is enabled, a port can autobaud to values different from the set values for speed, parity, and character size. As a result, a network management system can temporarily observe values different from what was previously set.

Valid Values: enabled (1)

disabled (2)

Default Value: enabled (1)

rs232AsyncPortParityErrs (counter)

This read-only MIB object displays the total number of characters with a parity error, input from the port since system reinitialization and while the port state was up or test.

rs232AsyncPortFramingErrs (counter)

This read-only MIB object displays the total number of characters with a framing error, input from the port since system reinitialization and while the port state was up or test.

rs232AsyncPortOverrunErrs (counter)

This read-only MIB object displays the total number of characters with an overrun error, input from the port since system reinitialization and while the port state was up or test.

The Input Signal Table

rs232InSigTable

This read-only MIB object displays a list of port input control signal entries.

rs232InSigEntry (integer)

This read-only MIB object displays input control signal status for a hardware port.

rs232InSigPortIndex (integer)

This read-only MIB object displays the value of rs232PortIndex for the port to which this entry belongs.

rs232InSigName (integer)

This read-only MIB object provides identification of a hardware signal. The signals and their values are as follows:

rts Request to Send (1)
cts Clear to Send (2)
dsr Data Set Ready (3)
dtr Data Terminal Ready (4)
ri Ring Indicator (5)
dcd Received Line Signal Detector (6)
sq Signal Quality Detector (7)
srs Data Signaling Rate Select or (8)
srts Secondary Request to Send (9)
scts Secondary Clear to Send (10)
sdcd Secondary Received Line Signal Detector (11)

rts Request to Send (1)
cts Clear to Send (2)
dsr Data Set Ready (3)
dtr Data Terminal Ready (4)
ri Ring Indicator (5)
dcd Received Line Signal Detector (6)
sq Signal Quality Detector (7)
srs Data Signaling Rate Selector (8)
srts Secondary Request to Send (9)
scts Secondary Clear to Send (10)
sdcd Secondary Received Line Signal Detector (11)

rs232OutSigState (integer)

This read-only MIB object displays the current signal state.

Valid Values: none (1)

on (2)

off (3)

rs232OutSigChanges (counter)

This read-only MIB object contains the number of times the signal has changed from on to off or from off to on.

Valid Values:	none	(1)
	odd	(2)
	even	(3)
	mark	(4)
	space	(5)
Default Value:	none	(1)

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