Pass-Through Mode; Data Format - SATO CL4NX Programming Reference Manual

Pass-through mode

Pass-through mode works when the power of printer is turned on.
Provides communication with printer via NFC tag.
Data communication is performed in between NFC device and NFC tag. The data is zipped and
unzipped by NFC controller and is sent to printer directly (through).
Purpose: Send small SBPL data (Print), Acquisition of printer setting, value, status.
* Small data here is about 1000 bytes (Assuming that device can hold this small data for two seconds or less
due to the operation. 8 Kbps from actual measurement). Handover mode is recommended to handle data
which is larger than 1000 bytes.
Note
If you are using NFC with printer is having near full operation (2 MB or more for printer receive
buffer), please check the status of buffer (RS parameter) with DC2+PG command and control
transmission (do not send print data until buffer near full is released) because this is not bidirectional
communication.

Data format

Transmission sequence
CRC-16-CCITT
Parent topic NFC
Data format
Sent and received data format
(1)
Number of data
byte
4 bytes
(1) Number of data byte
Set the number of compressed send and received data byte to big endian.
(2) Compressed send and received data
Set send and received data after it is compressed with zip.
The maximum data size before compression is 51200 bytes.
(3) CRC
Set CRC of send and received data before compression. Use CRC-16-CCITT for CRC.
Please refer to "CRC-16 CCITT" to be described hereinafter for the details.
Parent topic Pass-through mode
SBPL command
Status, Information on device
(2)
Compressed send and received data
NFC controller
Buffer: 50KB
744
(3)
CRC
2 bytes