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Chapter 6 - Pass-Through Mode
SNMP Access Gateway User’s Manual - v1.0 -- 11/99 - Page 22
Chapter 6 - Pass Through Mode
Pa
ss-through mode may be accessed from a network connection. A user enters pass-through mode from the main
menu by selecting either the ‘1’ or ‘2’ option. The ‘1’ option provides pass-through access to serial port I/O 1, and
the ‘2’ option provides pass-through access to serial port I/O 2.
SNMP Access Gateway Model unit Version 1.00
0. Enter Command Processor
1.
Enter Pass-Through to Port 1
2. Enter Pass-Through to Port 2
X. Exit (end connection)
<user enters ‘1’>
Pass-Through Port 1 Password: ------- <user enters password>
Pass-Through Port 1 Password Accepted
Exit Pass-Through Mode by Entering ESC-ESC-ESC
A p
ass-through connection accepts characters on the network connection and passes those characters to the selected
serial I/O port. Characters received on the serial I/O port are passed to the network connection.
When pass-through mode is entered, the escape character which may be used to exit pass-through mode is displayed.
In the example shown above, the ESC (27) character is shown as the escape character. The escape character may be
changed by using the SETUP command. When the escape character is entered on the network connection three
times within three seconds, the SNMP Access Gateway exits the pass-through mode connection and returns the
connection to the main menu.
When the escape character is entered the first and second times, the SNMP Access Gateway collects these characters
and does not pass them on to the serial I/O port. After the third escape character is collected, the SNMP Access
Gateway exits the pass-through connection. Thus, the escape characters are not passed through to the pass-through
port when the escape sequence is used to exit the pass-through mode. However, if three seconds passes between
escape characters, or if one or two escape characters are collected and then a character which is not the escape
character is collected, then all collected characters are passed through to the serial I/O port. The escape character
could then, for example, be changed to a capital letter ‘X’. Then pass-through access to the serial I/O port could be
terminated with three ‘X’ characters entered within three seconds, with no intervening characters. But use of a single
or two ‘X’ characters in the pass-through command session would still result in the ‘X’ characters being passed
through to the serial I/O port.
In the case where a user establishes a connection and selects an access port from the main menu and another user is
already logged into the same serial I/O port for pass-through access, the new user is given the opportunity to join in
the connection. Since the new user must have entered a valid password to access the port, a joining of the ports is
allowed. In this case the message which the SNMP Access Gateway sends to the new participant is:
Pass-Through Port 1 Password: ------- <user enters password>
Pass-Through Port 1 Password Accepted
A Session with Port 1 is Already Established with:
Network at IP 192.168.100.118
Do You Wish to Join the Session (Y/N) y
Session Joined.
After the user enters a letter, the SNMP Access Gateway either joins the connection or, if the user entered anything
other than a ‘Y’, drops the user back into the main menu. If joining the connection, the SNMP Access Gateway
provides a message to the user which shows what the escape character is.
If the connection is joined, then the user becomes an active participant in the connection.
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