
Functional Overview6-28
Firmware
Interface with mechanism
The following diagram shows the interface between the firmware and the hardware :
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.
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