Configure X.25 parameters
Digi TransPort User Guide 555
Calling user data
The calling user data field for a normal call can contain up to 12 bytes of user data. If the first
character is an exclamation mark (!), the PAD omits the 4-byte protocol identifier, and allows
the full 16 bytes as user data. The same is true for a fast select call, except the maximum
amount of user data is increased from 124 to 128 bytes. When entering user data, the tilde
character () can be used to toggle between ASCII and binary mode. In ASCII mode, data is
accepted as typed, but in binary mode, each byte must be entered as the required decimal
ASCII code separated by commas. For example, to enter the data Line1 followed by [CR][LF]
and Line2, you would enter:
DLine1~13,10~Line2
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