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How does the serial pass-thru work?

April 26, 2017pass-thru serial

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How does the serial pass-thru work?

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Serial pass-thru is a chain interface, like SCSI or keyboard wedge. It requires a terminator or terminating device at the end of the chain (the farthest device from the COM port). Pass-thru devices are usually output devices, and the choice of destination is controlled by pass-thru codes sent to all the devices before (closer to the COM port than) the destination device. Then those devices with pass-thru enabled will filter incoming data for the code to disable pass-thru, and if that code is not received, the data will be sent to the next device in the chain until it reaches a device without pass-thru enabled. Cash Drawers (CR3xxx) Back to top of Page Q: My cash drawer wont open! A: Thats not even a question.