HP Web Jetadmin Software Uživatelský manuál stáhnout pdf (Strana 24)

Each of these folders contain additional folders representing devices that Windows believes might

be connected to the designated port. A folder named Control exists in those device folders that

Windows believes are physically connected at that particular time.

The USBPRINT folders are dynamic. The Control folder exists when the device is connected and

does not exist when the device is disconnected.

The LPTENUM folders are not dynamic. The Control folder exists when the device is connected via

LPT1 only after a workstation reboot is performed. The same holds true when a device is

disconnected from LPT1. The Control folder is not removed until the workstation is rebooted.

Therefore, it is possible that a PC-connected device discovery might report that a device is

connected to LPT1 when in fact the device is physically disconnected.

4. Use the Microsoft wbemtest.exe file to determine whether the workstation successfully represents

the directly connected device in the registry by simulating the same WMI calls that HP Web

Jetadmin makes. Launch wbemtest.exe, and connect to a remote machine by entering the

machine name as part of a URL, such as \\machine_name\root\cimv2 (Figure 8). Click

Query (Figure 9) to run the select *from win32_pnpentity command and simulate a

WMI call to see what plug-and-play devices are found on the workstation. If plug-and-play

devices are recognized as connected, entries exist under the ports, such as USBPRINT, DOT4PRT,

and LPTENUM (Figures 10 and 11).

5. If the Windows Firewall is enabled, the workstation might have to be configured to allow

HP Web Jetadmin to make WMI calls to successfully discover devices. The Windows Firewall

Figure 8

Figure 9

Figure 10

Figure 11

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HP Web Jetadmin Software Uživatelský manuál Strana 24