SATO CL4NX Programming Reference Manual page 537

Note
● Please note the followings when using READY/BUSY.
When sending print data from the host, make sure the printer power is on before sending.
●
When data that is more than the receive buffer size (2.95 MB) is sent using XON/XOFF, Status 3, Status 4, and Status 5, a
receive buffer full error occurs. Therefore, send data equal to or less than 2.9 MB, and be sure to monitor the printer status
while sending the data.
●
Parity error will be detected when the parity error occurs after receiving ESC+A.