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Chapter 3 Printer Configuration
90
ACK/NAK
The ACK/NAK protocol gives the printer a means to acknowledge it
has either accepted a transmission (ACK) or did not receive a
transmission (NAK).
ENQ/ACK
The ENQ/ACK protocol enables the flow of communication to the
printer by sending a block of data, and ending the block with an
Enquiry (ENQ) signal. When the printer receives the ENQ signal, it
acknowledges the signal, thereby indicating it has received the
entire block of data.
SERIES 1, 1 CH
When you select the Series 1 with 1 Character protocol, the printer
does the following:
• When not ready to receive data (buffer 75% full), the printer
sends a buffer full response character to the host.
• When ready to receive data (buffer drops to 50% full), the
printer sends a buffer empty response character to the host.
• If the buffer ever fills completely, the printer sends a buffer full
response character to the host every time it receives a
character from the host.
• In addition, whenever the printer state changes from online to
offline (or vice-versa), the printer sends the appropriate
response character to the host.