ZETRON 2000 Series Spezifikationen PDF herunterladen (Seite 364)

Appendix A: TAP Protocol Summary

364 025-9035AA

Transferring Pages

Once initial logon successful:

This sequence is repeated for each alpha page to be sent.

M2x00 sends:

(Displayed) AED sends:

Notes

— <STX><pager#><CR>

<ETX><checksum><C

Send message to pager#. Pager # is exact # in database.

Checksum is arithmetic sum of all preceding 7-bit chars in

the block; the 12 LSBs of this sum are grouped into 3 4-bit

nybbles, 30h added to each nybble to make 3 ASCII chars.

The ASCII characters will be from the set 0-9:;<=>? with

any other value being illegal. (See checksum example on

following page.) A block can be no longer than 256

characters starting with the <STX> through the final <CR>.

The handling of long messages that would exceed the block

size limit will be described below.

<ACK><CR>msg — Page received OK. msg=* acknowledged *<LF><CR>

<NAK><CR>msg — Checksum error, retransmit requested. msg=* retransmit

*<LF><CR>

<RS><CR>msg — Invalid pager #, or too many (3) checksum retries. msg=*

transaction rejected *<LF><CR> In practice, the above

message is not seen. Instead, you will see one of these:

msg=Invalid pager number<CR><LF><CR>

msg=System error<CR><LF><CR>

msg=System busy<CR><LF><CR>

msg=Database error<CR><LF><CR>

msg=Message required - page cancelled<CR><LF><CR>

<ESC><EOT>msg — M2x00 disconnecting. msg=* bye *<LF><CR> The M2x00

will disconnect if the trunk or alpha input line has a timeout

programmed and there has been no input for the timeout

interval. This forced logout may also occur if too many (3 in

a row) <RS> events occur.

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ZETRON 2000 Series Spezifikationen Seite 364