Dascom 7010 Programmers Manual DMX Manuel d'utilisateur Page 137

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3 DTR protocol
(a) Conditions for making DTR signal Ready (High)
The following must be required:
Printer is on line.
Receive buffer has more than 1K bytes available.
Note: When receive buffer has less than 128 bytes available,
DTR signal becomes Busy (Low) level and this Busy (Low)
level is kept until receive buffer has at least 1 K bytes
available.
(b) Conditions for making DTR signal BUSY (Low)
Printer is in error.
Receive buffer has less than 128 bytes available.
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