HP 2500c Service Manual - Page 147
It identifies the Device ID.
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Firmware Physical Layer On the physical layer, the firmware performs the following functions : § It supports IEEE 1284 (bi-directional) compatibility in Forward mode. § It is able to return extended status reports to the host computer in Nibble mode. § It identifies the Device ID. § It negotiates between various modes. Data Link Layer On the data link layer, the firmware will perform : § Support channeling of commands, pacing, status, device ID and print data to their respective destination devices. § Perform limited frame checking and recovery. Application Layer On the application layer, the firmware's function is to : § Control the printing, media and pen. § Configure communication status. § Provide synchronized or asynchronized status reports. § Perform limited print mechanism error recovery. § Perform low-level device commands (e.g. change ID). Functional Overview 6-27