Table
J4 Pin # | Signal Name | Function |
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1 | USBPWR1 | USB1 +5 Volt Power |
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2 | USB1 Data- | |
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3 | USBP+1 | USB1 Data+ |
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4 | USBGND1 | Ground |
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5 | SHIELD1 | Cable Shield for USB1 |
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| Table |
J5 Pin # | Signal Name | Function |
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1 | USBPWR2 | USB2 +5 Volt Power |
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2 | USB2 Data- | |
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3 | USBP+2 | USB2 Data+ |
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4 | USBGND2 | Ground |
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5 | SHIELD2 | Cable Shield for USB2 |
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Infrared (IrDA) Interface
The Little Board P6d infrared interface provides for a
115K Baud. The FIR standard allows data rates up to 4Mbps.
Requirements for an IrDA Interface
On the Little Board P6d module, the IrDA physical link hardware consists of an IR transmit encoder and IR receiver decoder. To implement an IrDA port, the OEM must supply an IR transducer, which consists of the output driver and IR emitter for transmitting, and the receiver IR detector. Particular IR transducers may require additional external components.
The IrDA port uses the second serial port to drive its internal encoder/decoder. When using the IrDA interface, you cannot use serial 2 as an RS232, RS485, or RS422 port.
IrDA Connector (Part of Utility J19)
There are two popular implementations of Fast IR. One uses a separate receive line capable of receiving at the higher data rate (up to 4 Mbytes/second). The other is implemented with a mode control line. When the IR port is set for high speed, the mode select line (IRMODE) is high. This switches the external transceiver to high speed mode. The IrDA port pinout is listed in Table