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HCD-E1 Installation & Operation Manual Chapter 4 - Control from the Supervisory Port
11/01/00 19:23 Starting a Supervision Terminal Management Session 4-5
AUTOBAUD
Function
When the AUTOBAUD function is enabled, HCD-E1 can identify the
operating data rate of the terminal by analyzing the timing of three
consecutive Carriage Return + Line Feed characters (generated by pressing
three times the carriage return key). The detected data rate is then used for
the current communication session.
The automatic baud rate identification procedure is performed (or repeated)
whenever three consecutive carriage returns are received after one of the
following events occurs:
•
The DTR line has been switched OFF.
•
The EXIT command has been executed.
•
The idle disconnect time-out expired because no data has been
exchanged with the supervision terminal.
In case one of these events occurred, HCD-E1 assumes that the current
communication session has been terminated.
Note that when SLIP communication is required, the AUTOBAUD function
must be disabled.
4.3 Starting a Supervision Terminal Management
Session
Control Terminal
Configuration
Configure the terminal for the communication parameters used by the
HCD-E1 CONTROL DCE port, select the full-duplex mode, turn the terminal
echo off, and disable any type of flow control. For the initial configuration
session, it is recommended to use the default communication parameters:
9600 bps, one start bit, eight data bits, no parity, one stop bit. Connect the
terminal cable to the CONTROL DCE connector of the HCD-E1. Turn the
control terminal on. You are now ready to start a management session.
Preliminary
Settings for
Initial
Configuration
Session
If HCD-E1 does not respond (there is no echo or response to any command
entered at the terminal), this may be caused by one of the following:
•
CONTROL DCE communication parameters are not identical to those of
the terminal
•
HCD-E1 is configured to use a non-zero node number
You can cover both possibilities by setting the DB INIT switch to ON. This
will enforce the default communication parameters and the default (0) node
number, and disable the password protection in one action, and you will
then be able to start the communication session. However, HCD-E1 allows a
finer procedure, which lets you preserve your preset configuration. To do so,
follow the procedure below. Remember that all the changes will take place
only after you turn the HCD-E1 off for a short time, and then turn it back on.