| Pin | Symbol | Description | Notes |
|---|---|---|---|
| 6 | RXD | Receiver Data Output. Active Low. | Output is a low pulse for 2.4 µs when a light pulse is seen. |
| 7 | TXD | Transmitter Data Input. Active High. | Logic high turns the LED on. If held high longer than ~20 µs, the LED is turned off. TXD must be driven high or low. Do NOT float the pin. |
Reference: Agilent HSDL-3201 IR Transceiver datasheet
One oscilloscope probe is on the transmitter board, the second is on the receiver board. There appears to be some ground crosstalk between these signals.
| data rate | 8.68 µsec between pulses (115.2 kHz) |
| txd pulse width | 1.76 µsec (program determined) |
| rxd pulse width | 2.36 µsec (hardware determined, see above) |
Maintained by John Loomis, last updated 17 November 2009