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H
ARDWARE
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NTERFACE
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P I N D E S C R I P T I O N S
R X D a n d T X D
The LT2510 accepts 3.3 VDC TTL level asynchronous serial data from the OEM Host via the RXD pin. Data is sent from the
transceiver, at 3.3V levels, to the OEM Host via the TXD pin.
transceiver, at 3.3V levels, to the OEM Host via the TXD pin.
T e s t
Test Mode - When pulled logic Low before applying power or resetting, the transceiver's serial interface is forced to 9600, 8-N-1
(8 data bits, No parity, 1 stop bit): regardless of actual EEPROM setting. The interface timeout is also set to 3 ms and the RF
packet size is set to the default size for the selected RF Data Rate. To exit, the transceiver must be reset or power-cycled with Test
pin logic High or disconnected.
(8 data bits, No parity, 1 stop bit): regardless of actual EEPROM setting. The interface timeout is also set to 3 ms and the RF
packet size is set to the default size for the selected RF Data Rate. To exit, the transceiver must be reset or power-cycled with Test
pin logic High or disconnected.
Note: Because this pin disables some modes of operation, it should not be permanently pulled Low during normal operation.
U P _ R e s e t
UP_Reset provides a direct connection to the reset pin on the LT2510 microprocessor and is used to force a hard reset. For a valid
reset, reset must be asserted Low for an absolute minimum of 250 ns.
reset, reset must be asserted Low for an absolute minimum of 250 ns.
C o m m a n d / D a t a
When logic High, the transceiver interprets incoming serial data as transmit data to be sent to other transceivers. When logic Low,
the transceiver interprets incoming serial data as command data. When logic Low, data packets from the radio will not be
transmitted over the RF interface however incoming packets from other radios will still be received. RX Data Received can be
disabled by enabling CMD/Data RX Disable in the EEPROM.
the transceiver interprets incoming serial data as command data. When logic Low, data packets from the radio will not be
transmitted over the RF interface however incoming packets from other radios will still be received. RX Data Received can be
disabled by enabling CMD/Data RX Disable in the EEPROM.
I n R a n g e
The In Range pin will be driven low when a client radio is synchronized with a server. In Range will always be driven low on a
server.
server.
R T S H a n d s h a k i n g
With RTS mode disabled, the transceiver will send any received data to the OEM Host as soon as it is received. However, some
OEM Hosts are not able to accept data from the transceiver all of the time. With RTS enabled, the OEM Host can prevent the
transceiver from sending it data by de-asserting RTS (High). Once RTS is re-asserted (Low), the transceiver will send packets to
the OEM Host as they are received.
OEM Hosts are not able to accept data from the transceiver all of the time. With RTS enabled, the OEM Host can prevent the
transceiver from sending it data by de-asserting RTS (High). Once RTS is re-asserted (Low), the transceiver will send packets to
the OEM Host as they are received.
Note: Leaving RTS de-asserted for too long can cause data loss once the transceiver's receive buffer reaches capacity.
C T S H a n d s h a k i n g
If the transceiver buffer fills up and more bytes are sent to it before the buffer can be emptied, data loss will occur. The transceiver
prevents this loss by deasserting CTS High as the buffer fills up and asserting CTS Low as the buffer is emptied. CTS should be
monitored by the Host device and data flow to the radio should be stopped when CTS is High.
prevents this loss by deasserting CTS High as the buffer fills up and asserting CTS Low as the buffer is emptied. CTS should be
monitored by the Host device and data flow to the radio should be stopped when CTS is High.