Matrix Orbital GLK12232-25-SM - Manual (Page 51)

Host Display Comments
0xFE Command Prefix
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 file 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