Host
Display
Comments
0xFE
Command Pre?x
0xDB
XModem Upload Command
0x85
Command byte 1
0x06
Command byte 2
0x30
Command byte 3
0x00
Size Low Byte
0x40
Size High Byte
0x00
0
0x00
0
0x06
ACK (NAK if ?le is too big)
0x01
Start of Header
0x80
Block Count
0x7F
255 - Block Count
0x06
ACK (NAK if counts don't match)
<128 bytes>
Data Block
0x1E
CRC High Byte
0x47
CRC Low Byte
0x06
ACK (NAK if CRCs don't match)
0x7F
Block Count
0x80
255 - Block Count
0x06
ACK (NAKif counts don't match)
<128 bytes>
Data Block
0x5A
CRC High Byte
0x0D
CRC Low Byte
0x06
ACK (NAKif CRCs don't match)
...
...
...
0x04
End of Transmission
0x06
ACK (NAK if EOT is not expected)
Table 53: XModem Upload Protocol
Matrix Orbital GLK12232-25-SM
46