5. Description of the Option The data sender and the data receiver use the 8-bit value along with the DS and DR SB commands as follows:
8-bit value Meaning
0 Command sender suggests that he alone will handle
horizontal tab characters, for the connection.
1 to 250 Command sender suggests that the other party alone
should handle horizontal tab characters, but suggests that a delay of the indicated value be used. The value is the number of character-times to wait or number of NULs to insert in the data
stream before sending the next data character.
251 Command sender suggests that the other party alone
handle horizontal tabs, but suggests that each
occurrence of the character be replaced by a space.
252 Command sender suggests that the other party alone
handle horizontal tabs, but suggests that they be
discarded.
253 Command sender suggests that the other party alone
should handle horizontal tab characters, but
suggests that tabbing be simulated.
254 Command sender suggests that the other party alone
should handle horizontal tab characters, but
suggests that waiting for a character to be transmitted (on the other simplex connection) before sending more data. Note that, due to the assynchrony of the two simplex connections, phase
problems can occur with this option.
255 Command sender suggests that the other party alone
should handle output horizontal tabs and suggests
nothing about how it should be done.
The guiding rules are that:
1) if neither data receiver nor data sender wants to handle output horizontal tab characters, the data receiver must do it, and 2) if both data receiver and data sender wants to handle output horizontal tab characters, the data sender gets to do it.
The reasoning for the former rule is that if neither wants to do it, then the default in the NAOHTD option dominates. If both want to do it, the sender, who is presumed to have special knowledge about the data, should be allowed to do it, taking into account any suggestions the receiver may make. Simulation is defined as the replacement of the horizontal tab character by enough spaces to move the printer head (or line-pointer) to the next horizontal tab stop. Note that delays, controlled by the data sender, must consist of NUL characters inserted immediately after the horizontal tab character. This is necessary due to the assynchrony of network transmissions. As with all option negotiations, neither party should suggest a state already in effect except to refuse to negotiate; changes should be acknowledged; and once refused, an option should not be resuggested until "something changes" (e.g., another process starts). At any time, either party can disable further negotiation by giving the appropriate WON'T NAOHTD or DON'T NAOHTD command.
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