Specifications

P25 Development Guide
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The items marked ‘X’ must be present during the entire communication process.
The items marked ‘O’ must be present during certain parts of the process.
 During transmission, if C0H, C1H, and/or 7DH are shown in the DATA field, 7DH should be
inserted before the data and the data should be XORed with 20H and sent.
 During reception, if 7DH is encountered, 7DH should be ignored and the next byte should
be XORed with 20H and stored.
3.3 Process of Getting the Printer Status
Figure 1: Process of getting the printer status
It is recommended that the host send the same inquiry up to 5 times with 400ms time interval in
case of no response from the printer.