Abstract: A partial printing fluid short detection system can detect a partial printing fluid short in a print head. The partial printing fluid short detection system includes a timing circuit to detect a print gap of the print head, and the partial printing fluid short detection system can detect the partial printing fluid short in response to detection of the print gap.

Abstract: A partial printing fluid short detection system can detect a partial printing fluid short in a print head. The partial printing fluid short detection system includes a timing circuit to detect a print gap of the print head, and the partial printing fluid short detection system can detect the partial printing fluid short in response to detection of the print gap.

Abstract: A system (100, 500, 600, 800) of ink and multi-channel data delivery includes an optically transmissive tubular body (113) having at least two ends (105, 107). The tubular body (113) defines an ink channel between an ink supply (101) and at least one inkjet pen (117, 521, 525, 529, 901, 903). A multi-channel optical transmitter (111, 300, 400) is in optical communication with one end (105, 107) of the tubular body (113), and an optical receiver (115, 509, 511, 513) is in optical communication with another end (105, 107) of the tubular body (113).

Abstract: A fluid container includes a body having an inlet configured to receive a fluid, a printhead configured to eject the fluid received at the inlet, and an optical receiver at the body and positioned in optical communication with the inlet such that optical signals received at the inlet are received at the optical receiver.

Abstract: A system (100, 500, 600, 800) of ink and multi-channel data delivery includes an optically transmissive tubular body (113) having at least two ends (105, 107). The tubular body (113) defines an ink channel between an ink supply (101) and at least one inkjet pen (117, 521, 525, 529, 901, 903). A multi-channel optical transmitter (111, 300, 400) is in optical communication with one end (105, 107) of the tubular body (113), and an optical receiver (115, 509, 511, 513) is in optical communication with another end (105, 107) of the tubular body (113).

Abstract: Embodiments of a fluid container are disclosed. In some embodiments, the inkjet pen is configured to receive light and a fluid.

Abstract: A control circuit that provides a control signal to control, e.g., the hardware system of a server is disclosed. The control circuit operates based on the condition of the Baseboard Manageability Controller (BMC). Asserting the control signal turns on the hardware system, and the control circuit asserts the control signal when the control circuit has not received a heartbeat pulse from the BMC for more than a predetermined time. Further, the BMC is programmed to revoke generation of its heartbeat signal once it has completed initialization, and the BMC is programmed to deterministically generate a heartbeat within a predetermined time-period triggered on connection of AC power to the system.