TeleBoss 850 2.06.280_STD User Manual
Page 97
Pass-through
Pass-
through (also known as “Bypass”) is a bi-directional communication link for a serial, modem, Telnet or SSH
connection through the T850 to a device attached to a serial port. Pass-through is useful for configuring or
maintaining devices connected to the T850 without having to be in the same physical location.
Pass-through to a serial port is available on TCP ports 210
n
where ‘
n
’ is the number of the serial port.
Pass-through to a serial port is available via from any command processor, including serial, modem, Telnet or SSH
connections using the
BYPASS
n
command where ‘
n
’ is the number of the serial port.
To terminate a pass-through session, press the Escape Key three times.
Following is a table showing what pass-through sub-features/behaviors are applicable to the T850 and a detailed
description of each sub-feature below the table.
Sub-feature
T850
Bypass command
Yes
Adjustable end sequence pause
Yes
End sequence for network pass-through
3 escapes (via login menu) or 1 escape (via
bypass command)
End sequence for modem pass-through
1 escape (via bypass command)
Joinable sessions
Yes
Buffered pass-through
No
Allow serial break
Yes
Bypass command
The command
BYPASS
n
, where '
n
’ is the number of the serial port, is used from any command processor,
including serial, modem, Telnet or SSH connections to establish a pass-through connection
.
Adjustable end sequence pause
This feature means you can control the minimum amount of time between entering escape characters that the unit
will register as an authentic escape sequence. That is, you can set this to 1/4 second, meaning that in order to
escape pass-through, you must enter the escape sequence with at least 1/4 second between each escape. The
point is to make the unit disregard escape sequences that happen from the pass-through data itself, which is
assumed to travel across the link without pauses between the escape characters. The
sys.pt.endpause
setting
controls this.
Joinable sessions
Up to 3 pass-through sessions can be joined in that they all connect to the same serial port. Data arriving on the
serial port gets passed through to all parties, and data arriving from any one party gets passed through to the
connected serial port as well as the other parties. Joinable pass-through can be enabled/disabled in the
sys.pt.joinable
Setting Key.
Buffered pass-through
Buffered pass-through is where upon connecting to a pass-through session, the first thing the unit does is dump
all data that has been buffered in that port's database file, instead of connecting to the port right away. Once all
data from that file is output then unit connects you to the port. If no data has been buffered (or this feature is
turned off) then the unit initially connects you to the port. This option is not available on the T850.
Serial Break
The T850 gives a pass-
through client the ability to apply the 'serial break condition’ on any passthrough serial
port. A serial break can be a "wake up“ signal to a device connected to any of the T850 serial ports. This feature
allows the user to set: the ASCII character to be used for the break, and; the maximum number of times during the
current pass-through session the connected device will recognize that character as the break. After that number
of times, that character will not be interpreted as a break. This also allows the client to, within the same pass-
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