Specifications

P25 Development Guide
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3.4 Printing or Downloading Data
Figure 2: Process of printing data Figure 3: Process of software update
Note: The “Sending ENQ frame” is optional, it just let app know whether print is working normally,
customer could print data without sending this frame (that is only sending data frame).
In normal operation, after receiving the print data frame, the printer sends EOT, prints out the
data, and sends ETX; then it will wait for the next frame.
 Conditions of NACK frame issued
1) Different checksum value
2) No EOF (End of frame) received in maximum frame length time
3) No predefined number in Data Length field
When using those ESC/GS Commands with respond info (GS I n command), respond info
package would insert between EOT package and ACK package.