Specifications

Appendix A: TAP Protocol Summary
366 025-9035AA
After all pages have been transmitted the calling party should log off the M2x00. The
following sequence happens.
Checksum Example
The 12 bit checksum 17B hex is split into three 4 bit nibbles as 01, 07, 0B. An ASCII “0”,
value 30 hex, is then added to each nibble. The result is a string of three characters, 31 37
3B in hex or “17;” in ASCII. Note that the checksum may be calculated as a 16 bit number
for convenience, the high 4 bits would be ignored when preparing the ASCII form of the
checksum.
The complete block would be: “<STX>123<CR>ABC<CR><ETX>17;<CR>”
M2x00 sends:
(Displayed) AED sends:
Notes
— <EOT><CR> Entry device finished, logoff.
<ESC><EOT><CR>msg
and drop carrier and hang
up
— Acknowledge logoff.
msg=* bye *<LF><CR>
— drop carrier and hang up
Block characters ASCII Hex values
<STX> 02
131
232
333
<CR> 0D
A41
B42
C43
<CR> 0D
<ETX> 03
17B