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ADDR Terminal address (A-Y,0-6) + 80H
CMD Network command to terminal, 2 bytes, A-F,0-9
CS1 Checksum, first byte
CS2 Checksum, second byte
The checksum is calculated by adding each byte of the transmission, ADDR,
and length of data block (excluding STX and ETX). CS1 is high nibble (4
bits) +40H and CS2 is low nibble +40H.
Example: Command to load the file named A.EXE
STX ESC L A . E X E CS1 CS2 ADDR
Data block = ESC L A . E X E (excluding STX)
Length of data block = 7
CS = ESC + L + A + . + E + X + E + ADDR + 7
CS1 = high nibble of CS + 40H
CS2 = low nibble of CS + 40H
The ASCII data characters and their values are as follows:
STX 0x02
ETX 0x03
ACK 0x06
NAK 0x15
DC1 0x11
ESC 0x1B
EOT 0x04
The maximum frame size including protocol control characters is 128 bytes.
Transparent transmission of protocol control characters STX and ETX is
achieved by preceding them with a '\' (backslash) character. Transparent
transmission of the '\' character is achieved by sending two '\' characters
consecutively.
Rule of data convention during data transmission:
1) One-byte data converted to two-byte data