HP Web Jetadmin - Discovering PC-Connected Devices

Comparisons of networked vs. PC Connected for SNMP, LEDM and WS* based printers

SUPPORTED DEVICES

WMI

A device can be discovered via WMI as long it supports plug-and-play and bi-directional

communication has been established that allows the device plug-and-play ID to be placed into the

registry. Both HP and third-party devices can be discovered via WMI. In fact, the printer driver is

irrelevant in this case, as the plug-and-play ID—not the driver name—is displayed as the model of the

discovered device. The plug-and-play ID represents the physically connected device, no matter which

driver is being used. Devices connected via LPT ports can pose a slight problem as the plug-and-play

ID is only added or removed from the registry after a workstation power cycle.

SNMP Proxy

The HP SNMP Proxy Agent supports a wide variety of SNMP capable HP devices directly connected

to client machines that meet the following criteria:

 Windows SNMP service must be installed and configured to allow queries from the HP Web

Jetadmin server. The community name should be set to “public” for read access.

 Firewall settings should be appropriately modified to allow HP Web Jetadmin to query the

HP SNMP Proxy Agent (which means UDP port 161 should be open for SNMP queries).

 Printers must be installed using a DOT4 bi-directional capable driver or a driver containing a

special language monitor in order to respond to SNMP queries

For directly-connected devices to be discovered via HP SNMP Proxy Agent, proper communication

between the device and client machine must be provided. For devices that support DOT4, use a

driver that provides an HP DOT4 port connection, whether the connection is via USB or LPT. An

example of the correct port type is “DOT4_001”. If the port type is different (for instance, LPT1 or

USB001), the following options can provide a proper DOT4 capable driver:

 Use the HP Universal Print Driver (UPD) version 4.5 or greater

 Use the HP printing system software CD that came with the device to install the HP DOT4 port