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X.3 PAD Parameters
page 88
20:n Echo mask
This parameter specifies the characters from the workstation for which the PAD is to echo
back to the DTE (terminal). The echo mask applies only when parameter 2 (echo) is set to 1.
Coding of parameter 20 can be a single value or the sum of any combination of values listed
above. If parameter 5, 12 or 22 is set to a non-zero value, then X-ON (DC1) and X-OFF (DC3)
are not echoed.
21:n Parity treatment
Not necessary for a software PAD, since an asynchronous signal is not being generated.
Parameter 21 is permanently set to 0 and does not influence parity.
If your application generates parity signals, however, then the PAD will also generate them
and will incorporate them into the packets it transmits. In this case the PAD will also remove
parity signals from incoming packets before sending the data to your application.
22:n Page wait
The workstation will be able to suspend the transmission of additional characters after a
specified number of linefeeds have been received. No further data will be transmitted until
the page wait condition is canceled.
The workstation will cancel the page wait condition and resume normal transmission on receipt
of an X-ON character (Ctrl-Q).
Value Description
0 No Echo mask (all characters echoed)
1 No echo of character CR
2 No echo of character LF
4 No echo of characters VT, HT, FF
8 No echo of characters BEL, BS
16 No echo of characters ESC, ENQ
32 No echo of characters ACK, NAK, STX, SOH, EOT, ETB, ETX
64 No echo of editing characters as designated by parameters 16, 17, and 18
128 No echo of all other ASCII control characters (0-31) not mentioned above,
and the character DEL (ASCII character 127)
Value Description
0 No parity checking or generation
Value Description
0 Page wait disabled
1-255 Page wait condition after n linefeed characters are received by the workstation
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