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參數(shù)資料
| 型號： | PS2000ACQ |
| 英文描述： | A Network Communication Controller Designed to Connect Any MCU Application System To A Gateway(單片網(wǎng)絡(luò)通信控制器,用于控制MCU和網(wǎng)絡(luò)服務(wù)器之間的信息交換) |
| 中文描述： | 通信控制器的網(wǎng)絡(luò)連接任何設(shè)計單片機應(yīng)用系統(tǒng)到一個網(wǎng)關(guān)（單片網(wǎng)絡(luò)通信控制器，用于控制微控制器和網(wǎng)絡(luò)服務(wù)器之間的信息交換） |
| 文件頁數(shù)： | 46/54頁 |
| 文件大?。?/td> | 594K |
| 代理商： | PS2000ACQ |
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PS2000A Datasheet
Doc. Number:
TECINHD001
Version 1.0
3/1/2002
11.2.2 Clearing the Super Password
P&S DataCom Corporation
42
The super password is so important that users should use it carefully.
Although the PS2000A cannot use the WRIT command to clear the super password, it
provides a method of loading a timing signal to clear the password. After the PS2000A is
powered on reset, the internal super password will be cleared by inputting a timing signal
on the DO and INT pin of the PS2000A. The timing of clearing the password of the
PS2000A is shown in Figure 29.
Td=300ms
±
10ms; T1
≥
500ms; 100ms
≤
T2
≤
300ms
Figure 29 The timing diagram of clearing the super password of the PS2000A
After the super password is cleared, the network server and the DPTGT must set the
super password again. In this case, the PS2000A is allowed to write a new Device
Property Table.
In the Figure 29, the timing signal can be input on the pins of the PS2000A correctly only
through the MCU application system. It should be noted that the DO and /INT pin of the
PS2000A are inputs during this time. And, they are outputs in the normal condition. The
designers of the MCU application system should determine if they will use this method
to clear the super password in the PS2000A or not.
To improve the security of the system, the PS2000A doesn’t provide the method of
clearing the super password remotely.
11.2.3 Loading the Device Property Table
The network server or the DPTGT must use CONT to connect to the PS2000A with the
super password and get its receiving and transmitting buffer section’s parameters before
loading the device property table in the PS2000A. If the network server or the DPTGT
don’t connect to the PS2000A, the PS2000A will refuse to receive the downloaded device
property table.
When the network server connects to the PS2000A with the super password, the
receiving and transmitting buffer section of the PS2000A is fixed as 56 bytes.
The DPTGT uses WRPR to load the device property table data into the device, the data
/INT
T1
T2
Td
Input state isn’t tested during the time
PS2000A resets
DO
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