Denso BHT-200QW Especificações Página 151

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Chapter 12. Power-related Functions
143
[2] Remote wakeup operation
About BHT internal operation enabling remote wakeup
About BHT internal operation enabling remote wakeupAbout BHT internal operation enabling remote wakeup
About BHT internal operation enabling remote wakeup
If the BHT is turned off normally* with the remote wakeup function activated, then it will
become ready to receive commands from the host computer at the timing shown below during
the specified timeout period. During this operation, nothing appears on the LCD.
(*"Turned off normally" refers to turned-off with the PW key, with the auto power-off feature, or
with END, POWER OFF, or POWER 0 statement. If the BHT is shut down due to low battery
or no battery loaded, it will no longer become ready for remote wakeup operation.)
Set up the host computer and BHT so that the BHT may receive commands from the host
computer at the timing shown above, referring to the typical operation flow given below.
Configuring the BHT for the remote wakeup
Configuring the BHT for the remote wakeupConfiguring the BHT for the remote wakeup
Configuring the BHT for the remote wakeup
To use the remote wakeup, you need to configure the BHT in System Mode or in user
programs as listed below.
For the operating procedure in System Mode, refer to the BHT User's Manual. For that in user
programs, refer to "[ 3 ] Remote wakeup program."
Items Set values
Remote wakeup function Activate
Transmission speed Match the CU's and host's transmission speed.
Timeout period (Effective hours) Match the timeout specified in the host's
application.
Typical operation flow
Typical operation flowTypical operation flow
Typical operation flow
At the host computer
At the host computerAt the host computer
At the host computer
(1) Send a "WAKE" character string to the BHT.
(2) Wait for a response from the BHT.
-If the host receives "ACK + 0 + ID":
The host should conduct transactions with the remote wakeup program in the BHT.
-If the host receives "EOT + 1 + ID":
The host should proceed to the corresponding error processing.
BHT is ready for
remote wakeu
p
BHT is off
Timeout period for waiting a wakeup
command from the host computer
1 min.
(Max. interval
error: -1 min.
)
1 min.
100 ms
(
Read
y
to receive commands
)
1 min.
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