7.26
SEL-2032
Communications Processor
Instruction Manual
Date Code 20120126
Settings
Automatic Message (SET A) Settings
Restricting Port
Access with
NOCONN
You can use the NOCONN setting to terminate any active Modem,
Transparent, and Virtual Terminal connections and disable access to a port.
The SEL
OGIC
equation you enter for the NOCONN setting controls the value
of the NOCONN bit for that port. When the NOCONN bit asserts on a port
with any of the aforementioned connections, transmissions in progress are
aborted, reception of characters are terminated, and the connections are
dropped. The termination will appear as a port timeout.
When a Modem, Transparent, or Virtual Terminal connection exists on a port
or SEL Master port, the SEL-2032 checks the state of the port’s NOCONN bit
at least once per second.
When the NOCONN bit asserts, the reception and transmission of data will be
restricted as defined below.
Modem Ports
The SEL-2032 checks the NOCONN bit before answering a call from a
modem. If the bit is asserted (1), then the SEL-2032 will not answer.
When the NOCONN bit is asserted, the SEL-2032 will abort an automatic
message when the \I…/ string is read. This includes an automatic dial-out
message string. If you prefer to not have automatic dial-out blocked, you can
adjust the NOCONN logic so the NOCONN bit is always de-asserted (0)
when dial-out is triggered.
If you connect via modem to a Master port to create a transparent (or Virtual
Terminal) connection to a Slave port or protocol card, assertion of the
NOCONN bit on the Master port will terminate both the modem connection
and the connection to the Slave port or card.
Master SEL Ports
When the NOCONN bit is asserted on a Master SEL port, the SEL-2032
limits data reception to Fast Operate commands, clears the XOFF status (to
enable transmission of characters once NOCONN is de-asserted) and restricts
access to the port. The SEL-2032 will only process Fast Operate commands
while the NOCONN bit is asserted. All other commands, messages and
characters will be ignored. If you also require Fast Operate commands to be
ignored, you must set the FAST_OP setting to ‘N’. While the NOCONN bit is
asserted, the SEL-2032 will not output a command prompt in response to any
commands or messages.
While the NOCONN bit is asserted, the SEL-2032 will continue to transmit
any message triggered by the ISSUE
x
setting. The NUM_MESG counter will
be incremented whenever a message is triggered (Master ports do not support
parsing or storing responses from a triggered message, so you will not be able
to detect communication failures or bad messages). You may override the
transmission of messages while NOCONN is asserted by including
!(<port
number>:NOCONN)
in the ISSUE
x
setting.
If Unsolicited SER reporting is enabled and the NOCONN bit is asserted, the
SEL-2032 shall temporarily disable Unsolicited SER reporting. Once the
NOCONN bit is de-asserted, Unsolicited SER reporting will resume. It is not
necessary for the Fast Message client to re-enable SER reporting if it was
enabled before NOCONN was de-asserted. If an Unsolicited SER message is
unacknowledged when the NOCONN bit asserted, it shall be regenerated with
the exact same data content except for the status byte (which will contain the
current system state) once the NOCONN bit is de-asserted. It is recommended
Содержание SEL-2032
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