With serial remote control protocols the standard communication format consists of a command being sent to the device, which then replies with an acknowledge and/or data bytes.

In order to gain an estimate of the time taken for a device to reply to a command, the usual approach has involved studying oscilloscope traces while monitoring data signals from breakout boxes.

ComTimer can transmit a sequence of commands and time the arrival of the response to millisecond accuracy using the high precision timers available in Pentium processors.