User's Manual

The DIOS PIU and Piccolo-XR Units

PIU Connectors

The PIU connectors (see Figure 18):

• RS232 (RJ45, 8 pin)

• RS485 (RJ10, 4 pin)

• Adapter port (RJ10, 4 pin)

• PGND And Power Switch (TB 3 pin)

• 24 V AC PWR IN (2 pin)

• 6, 9, 12 V DC Battery Input (2 pin)

PIU LED Operation

Three software programmable LED indicators are located on

the PIU enclosure (see Figure 18). These indicators can be used

for diagnostics purposes.

• Radio TX/RX (RED): ON – a valid frame is received by the

internal DPSK modem or the PIU transmits a frame.

• RS232/RS485 RX/TX (ORANGE): ON – a valid frame is

received or transmitted through the RS232/RS485 port

(UART1).

• Adapter port TX/RX (GREEN): ON – a valid frame is

received or transmitted through the adapter port (UART2),

or the Radio is being programmed.