HP 2500c Service Manual - Page 148

encoder strip to read and send data back to the firmware.

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Firmware Interface with mechanism The following diagram shows the interface between the firmware and the hardware : (hardware-firmware interface diagram) § Paper Motor control is an open-looped control. The firmware does not know the exact position or the size of the paper and relies on the OOPs flag to confirm the presence of paper. § Service Station control is also an open-looped control. There is no feedback to the firmware from the Service Station. § Carriage Control is a closed-loop control. The Carriage PCA is enabled by the encoder strip to read and send data back to the firmware. § Pen information is also controlled by a closed loop. The firmware is therefore able to receives printing data such as pen firing parameters, pen ID and pen temperature from the active pen. 6-28 Functional Overview

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Functional Overview
6-28
Firmware
Interface with mechanism
The following diagram shows the interface between the firmware and the hardware :
(hardware-firmware interface diagram)
§
Paper Motor control is an open-looped control. The firmware does not know the exact
position or the size of the paper and relies on the OOPs flag to confirm the presence
of paper.
§
Service Station control is also an open-looped control. There is no feedback to the
firmware from the Service Station.
§
Carriage Control is a closed-loop control. The Carriage PCA is enabled by the
encoder strip to read and send data back to the firmware.
§
Pen information is also controlled by a closed loop. The firmware is therefore able to
receives printing data such as pen firing parameters, pen ID and pen temperature from
the active pen.