User's Manual

OSMAC Base User Manual
Page 27
Manu.01_0405
7.2.3 EOT
Whenever the OSMAC Base terminates a session by sending the <EOT><CR> sequence, it will drop
the DTR signal on the RS-232 signal for 250mS. This will normally cause any modem connected to it
to disconnect.
7.3 Sending Multiple-Line Pages
If you wish a message to continue on another line of a multi-line pager, you cannot send the <CR>
return into the serial port. Use the TAB character instead of a <CR>. The OSMAC Base will translate
it to a <CR> when it sends the page to the pager.
7.4 Computing the Checksum
The checksum is a simple arithmetic sum of the 7-bit values of all characters preceding it. The
checksum reported is the least significant 12 bits of this summation, converted to BCD ASCII.
Checksum Example:
STX 000 0010
1 011 0001
2 011 0010
3 011 0011
<0CR> 000 1101
A 100 0001
B 100 0010
C 100 0011
<CR> 000 1101
ETX 000 0011
Total
10111 1011
Convert to BCD 1 0111 1011
Answer in BCD
ASCII
17 ;
7.5 COMP1
COMP1 allows a "dumb terminal" to be used to send a page, although any device that can output RS-
232 data can be used.
All data entering the serial port is sent to pager number 0. The reception of a <CR> initiates the page.
Manual Entry of a Page
Entry Device OSMAC Base Action Comment
<Message><CR> The Entry Device (in this case it is
often a user on a terminal) types in the
message to send to a pre-set pager.
Characters are echoed back.