Denso BHT-BASIC 100 SERIES, Programmer'S Manual

Page: 169 / 577

Chapter 12. Power-related Functions
161
At the BHT
(1) Turn the BHT off and put it on the CU.
The BHT will enter into the charge state* (i.e., into sleep). (For details about charging, refer
to the BHT User’s Manual.)
*Charge state: Charging or charged-up state
(2) Upon receipt of any data via the IR port, the BHT wakes up. After the specified time length
(approx. 10 ms), the BHT becomes ready to receive data.
If no data comes in within the specified timeout period*
1
, then the BHT will go back to step
(1).
(3) If the BHT receives any data, it will check the data. If the BHT detects a “WAKE” character
string in the data, it will proceed; if not, the BHT will go back to step (1).
(4) The BHT will send the following response to the host computer depending upon whether
or not a remote wakeup program exists in the BHT and whether the remote wakeup func-
tion is activated or deactivated.
**ID: 6-byte numeric string that refers to the lower 6 digits of the BHT product number.
*
1
The timeout period specified in "[ 3 ] Remote wakeup program, step (3)" will apply.
*
2
Upon receipt of "WAKE" as receive data, the BHT sends a response message.
(5) The BHT will exit from the sleep state and execute the remote wakeup program developed
by the user.
Remote wakeup
program
Remote wakeup
feature
Response message
from the BHT
Proceeds to:
Exists Activated
Deactivated ACK + "0" + ID
**
ACK + "2" + ID
(5)
(1)
Not exist Activated
Deactivated ACK + "1" + ID
ACK + "1" + ID (1)
(1)
Host computer BHT
Send one
character
After approx.
100 ms has passed
Send "WAKE."
Waiting for
response
Any
response
received?
No
Yes
Conduct transactions
with the remote
wakeup program
In charge state
Waiting for
"WAKE"
"WAKE" received?
No
(Timeout)*
Yes
Send response*
Start the remote
wakeup program
Conduct transactions
with the host program
"A"
"WAKE"
ACK + "0" + ID
1
2
Transacted by the
BHT system program