Radio modems provide a simple wireless link with the ability to send any message protocol at any data rate up to the maximum quoted. They provide a simple means of passing RS232 data streams with no message overhead in the form of extra addressing or error-checking codes.

The MP2519 modem pcb is designed to operate with Magenta's synthesized Radio Modules. It is a non-intelligent device to provide a serial radio data link primarily for incorporating into OEM's systems.

Serial data supplied to the transmitter input is reproduced at the distant receiver's output. Only when operating near the limit of maximum range will the received output be prone to data corruptions.

An I²C bus is used to control all modem functions as well as the transceiver functions such as frequency selection, transmitter-receiver switching and power control.

When the transmitter is switched off at the end of a message, a short burst of noise may occur before the receiver's mute operates. This noise should be ignored by the system connected to the receiver.

The user may need to provide error checking and/or addressing to each mesage if the application requires guaranteed data integrity.

Options are available for RS232 or TTL data levels. The transceiver must be ordered separately.

Technical Details
General

TX-RX Changeover	<6ms
TX and RX Risetime	<6ms
Data Rate	1200 baud (2400 or 4800 optional-state with order)
Supply Voltage	5Vdc
Dimensions	Fits on top of radio module-adds 7mm to height
Operating Temperature	-30 to +60° C
Humidity	95% RH, non-condensing
Current Consumption	5mA excluding radio

Technical Details
Connections

1	+V	5V Positive supply
2	SCL	I2C clock
3	TXD	TX data input, RS232 levels
4	0V	Ground, negative supply
5	RXD	RX data output, RS232 levels
6	/CD	RX carrier detect, TTL active low
7	SDA	I2C data
8	-	No pin (for connector polarity)
9	RSSI	Received Signal Strength Indicator
10	Spare
Coaxial MCX		50 ohm antenna connection (connect direct to transceiver)