6.9.1 Password Entry
1. Press to enter the programming mode.
2. Scroll
or until “
3$66
”. Press REs .
3. “ ” flashes followed by “
”. Press REs .
4. “
” and “
” flashes.
5. Use
, and to change display to “
”. Press REs .
6. “
*RRG
” displays followed by “
&+*
”.
7. Press
to return to the main menu in order to continue programming.
6.9.2 Changing the Password
1. Follow previous steps 1 through 5, then press REs .
2. “ ” flashes on the screen followed by “
”. Press REs .
3. Press
, and to change to any number between 0-999. Press REs .
“ ” will display followed by “
&+*
.”
4. Press
twice to return to main menu. Save changes.
7. RS-485 COMMUNICATIONS
The RS-485 card is used for communication in a network where multiple sensors
(not necessarily Hawk 3 sensors) report back to a central host computer.
The RS-485 card is configured for 9600 baud, 8 bit, 1 stop bit, no parity, half duplex
serial communication, and will respond on a polled basis only. Each Hawk 3 will
respond to its own unique address only after being requested by the host. The
Hawk 3 remains a listener until asked to respond.
7.1 RS-485 Command Structure
[Prefix][Address][Command][Checksum][Carriage Return]
7.2 Prefix
The Hawk 3 listens for messages beginning with one of two prefix characters, the
dollar sign ($ , ASCII 36, 24h) or the pound sign (# , ASCII 35, 23h).
The dollar sign ($) requests a short response from the Hawk and the pound sign
(#) requests a long response with checksum from the Hawk.
7.3 Address
The next two characters represent the unit’s address. The characters can range
from “01” to “99”. All other characters in this position are ignored. This will match
the corresponding address on the Hawk 3 unit.
For example: With the address on the Hawk set at “01” the command to address
it would be “$01”.
The same scheme is used to derive the checksum on a long response, the carriage
return is again not calculated into the checksum.
29
3
UG(QWU
$
3
UG(QWU
$
&+*G3
UG
$
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