Denso Power Net Terminal BHT-7500 Dokumentacja Pobierz pdf (Strona 179)

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12.4 Remote Wakeup Function

(BHT-7000/BHT-7500)

[ 1 ] Outline

The remote wakeup function allows you to remotely power on the BHT and run the specified

user program (hereafter referred to "remote wakeup program") by sending the specified mes-

sage from the host computer to the BHT via the CU.

Developing user programs utilizing the remote wakeup at both the host computer and BHT

enables you to automatically maintain the master system or update user programs.

To use the remote wakeup between the BHT and host computer, the following is required:

• Optical communications unit CU-7001 (The CU-7002 does not support the remote

wakeup.)

• CU interface cable

[ 2 ] Remote wakeup operation

■ At the BHT

(1) Power off the BHT 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-7000 User's Manual" or "BHT-7500 User's Manual.")

*Charge state: Charging or charged-up state

(2) Upon receipt of any data via the IR port, the BHT wakes up and becomes ready to receive

data.

If no data comes in within the specified time (described in [ 3 ], ■ Setting the remote

wakeup), 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 function

is activated or deactivated.

Since the BHT in the charge state is in sleep, it will not receive the 1st “WAKE” character

string normally. To wake up the BHT, you need to send a “WAKE” character string at

lease two times, for example, send “WAKEWAKE” or “WAKEWAKEWAKE.”

ID is a 6-byte numeric string referring to the lower 6 digits of the BHT serial number.

Remote wakeup

program

Remote wakeup

function

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

(1)

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