RAD Data comm HCD-E1 ,

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

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.

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.

Configuration

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.