Printronix L5035 user manual Ack/Nak

Chapter 3 Printer Configuration

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.

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