User's Manual

38 Interface specification: Pin descriptions
Integrator’s Guide – RIM 902M OEM Radio Modem
Pin 6 ~COV ~Coverage
This is an output from the radio.
The active state of this line is low, and indicates that the radio is in network
coverage, as measured by the presence of a signal from the network base
station.
When the radio does not have contact with the wireless network, this line is
high.
Pin 9 GND Ground
This line should be tied to the system ground of the host unit to ensure proper
operation.
Pin 10 TURNON Turn Radio On
This is an input to the radio.
This line turns on the radio unit. It is a digital signal that eliminates the need
for an on/off switch across the power supply to the radio. Information about the
use of this pin is contained in the next section of this chapter.
Pin 11 ONI On Indicate
This output from the radio that indicates that the radio is on and operational.
This line may be used by a computing device to qualify the handshaking
outputs on the serial interface. If CTS is low, and ONI is high, then the unit is
ready to receive data, but if CTS is low and ONI is low, then the radio is not
ready to receive data because it is off.
When ONI is low, all inputs to the radio should be held low or disconnected.
Otherwise, power will be consumed and wasted.