Solution:
On a reverse telnet connection, the break has to be generated by the Telnet client on the LAN to a serial device on the IOLAN+ Port.
Configure the IOLAN+ Port as follows:
Access [Remote]
Mode [Telnet]
save & exit the port, then kill the port for changes to take effect.
Now from LAN attached workstation, telnet to the IOLAN's local port number.
For example, telnet 192.168.1.1 10004
When connected, press the ctrl and ] keys together. The telnet prompt will appear as follows:
telnet>
At the telnet pormpt, type: send brk
When the send brk command is sent, the IOLAN+ will send a hardware break.
Note: There are Windows based program that have the "send break" function built in. Programs such as the Winsock version of Hyperterminal or freeware software such as Netterm.
If there is a modem attached to the IOLAN+ Port, then you must configure the modem to transmit a break signal. Check with your modem manufacturer for the proper command for your modem's initialization string.
For example, the proper command for a Rockwell modem to be able to transmit a break is \Bn
See excerpt below.
\Bn - Transmit Break to Remote
In non-error correction mode, the modem will transmit a break signal to the remote modem with a length in multiples of 100 ms according to parameter specified. If a number in excess of 9 is entered, 9 is used.
The command works in conjunction with the \K command. In error correction mode, the modem will signal a break through the active error correction protocol, giving no indication of the length.
\B1-\B9 Break length in 100 ms units. (Default = 3.) (Non-error corrected mode only.)
Result Codes:
OK If connected in data modem mode.
NO CARRIER If not connected or connected in fax modem mode.
Note: When the modem receives a break from the remote modem, break is passed to the DTE as follows: In non-error correction mode direct, the break length is passed; in non-error correction mode normal and in
error correction mode, a 300 ms break is passed.