Configuring legacy protocols Configure TPAD parameters
Digi TransPort® Routers User Guide
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means declined. Entering a number for this parameter causes the router to use that number in
place of the default response code. A value of 0 prevents the router from replying.
Clearing time n milliseconds
The clearing time, in milliseconds, that an X.25 call is left open after receiving a response from
the host. Each response from the host resets this timer.
Delay transmitting the APACS 30 string for x milliseconds after connecting to
X.25 host
Setting this parameter causes the router to pause for the specified number of milliseconds in
between successfully connecting to the remote X.25 host and transmitting the APACS 30
string.
Retransmit APACS 30 string if error detected
Enabling this setting causes the router to retransmit the APACS 30 string to the terminal if an
error is detected, such as no ACK received from terminal.
STX/ETX removal
Enabling Del STX&ETX causes the router to strip off the STX and ETX characters that normally
surround the APACS 30 string before sending it to the host. Enabling Del STX only causes the
router to strip the STX character only.
Do not transmit ENQ characters
The TPAD protocol normally uses the ENQ character to indicate that a call has connected and
that the TPAD terminal may proceed with the transaction. Enabling this parameter prevents
the router from transmitting ENQ characters to the TPAD terminal when a connection is made.
Delay sending ENQ characters to TPAD terminal for x milliseconds when a
call has been connected
Set s the delay, in milliseconds, from when the router first connects the call to when it
transmits the ENQ to the terminal. By default, there is no delay.
Wait for x milliseconds for an ACK before retransmitting the data
The time the router waits for an ACK character to be received after sending data to the
terminal. If an ACK character is not received within this time, the data is retransmitted. A value
of 0 sets a delay of 1 second (the default).
Transmit TPAD transactions directly in a Synchronous frame
If enabled, TPAD transactions are transmitted without any outer protocol, such as X.25, such as
they are placed directly in a synchronous frame on ISDN. This sometimes referred to as HDLC
by certain card acquirers.
Include LRC
The LRC (Longitudinal Redundancy Check) is a form of error checking that may be required by
some TPAD terminals. When the Include LRC option is enabled the router will check the LRC
sent by the terminal and if it indicates a problem has occurred NAK the message. If this
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