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Chapter 9 Specifications
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DTR protocol
DTR signal "Ready (High)" level requirements:
The following must be satisfied:
• 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 1K bytes available.
DTR signal "Busy (Low)" level requirements:
The following must be satisfied:
• Printer is in error.
• Receive buffer has less than 128 bytes available.
Pin assignment