with other items such as the MAC address and IP address. Some functionality, such as Reports, is blocked in HP Web Jetadmin if the serial number cannot be obtained. Therefore, HP Web Jetadmin makes a strong effort to obtain the serial number from third-party devices. The most typical and widely supported object to extract for obtaining the serial number is prtGeneralSerialNumber.

●Status: Device status, which indicates the current state of the printer (for example, online or paper jam), is displayed based on responses to standard objects such as hrPrinterDetectedErrorState.

●System Contact: The system contact is displayed from the response to sysContact.

●Storage: The presence of storage media such as a hard disk, flash disk, RAM disk, and installed RAM can be detected using hrDiskStorage objects. Additional storage information is provided on the Storage tab for certified devices.

●Remaining Input Tray Levels: The approximate amount of paper remaining in a particular tray can be displayed by calculating a percentage based on responses to the Standard MIB objects prtInputCurrentLevel and prtInputMaxCapacity.

●Remaining Toner Levels: The approximate amount of toner or ink remaining in the cartridge cavity is determined by calculating a percentage based on prtMarkerSuppliesLevel and prtMarkerSuppliesMaxCapacity.

●Reports: Basic support includes only the Device Inventory report. Advanced support may include reports that make use of the various supported page count values, such as Accessories Inventory (capabilities), Supply Utilization (marker supply information), Device Utilization (page counters), and Hourly Peak Usage (hourly page counters).

Troubleshooting

Determining why a particular non-HP device supports the features that it does is usually a result of the device's ability to answer the queries HP Web Jetadmin sends. Certified devices have known objects written in their device plug-ins and those objects have already been tested, so issues rarely occur on those devices. However, for qualified devices and those requiring basic support, HP Web Jetadmin is dependent on the device to answer industry-standard queries. Some devices support more gauges than others. You cannot always assume that all devices from a particular vendor support the same features. For example, one Xerox model may support the control panel display, while another Xerox model does not. The following are common explanations for why particular items may not appear for devices.

Issue

Resolution

A gauge may be present for a consumable, but the gauge is hashed out instead of containing a remaining percentage.

If a devices answers prtMarkerSuppliesDescription correctly, the gauge is present because HP Web Jetadmin knows the consumable exists. However, if the device cannot answer either prtMarkerSuppliesMaxCapacity or prtMarkerSuppliesLevel correctly, the percentage cannot be calculated and

HP Web Jetadmin displays hashes instead to indicate an unknown level.

A paper tray gauge does not indicate a remaining percentage.

While a device answers the prtInputType query to indicate a tray is present, the device may respond to the prtInputMaxCapacity and prtInputCurrentLevel queries with either valid values or an indication that at least one sheet remains. If the device returns valid values, a calculation is presented. If the device does not provide valid values, HP Web Jetadmin displays either Empty or Not Empty, depending on whether the device indicates at least one sheet remains.

The control panel displays Not Supported or Unknown.

Not Supported indicates the device did not respond to the

 

prtConsoleDisplayBufferText object. Unknown may indicate that

 

the devices recognizes the prtConsoleDisplayBufferText object,

 

but did respond with any text.

 

 

ENWW

Discovery 145