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With the ATM-173R monitors, you may use either a serial or USB data connection. All other ATM-173R series models use USB only. Choose the appropriate data cable from the accessory kit included with your monitor. Please note that all Aspen displays that include an MSR or MSR/Customer Display also have an USB hub internal to the display to interface the peripheral devices. As a result, the display will have only one USB cable for touch data and the MSR/Customer Display data. Also, two additional U