RIM 902M, Integrator Manual

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40 Interface specification: Pin descriptions
Integrator’s Guide – RIM 902M OEM Radio Modem
This is an output from the RIM 900 to the computing device. This line is
asserted low by the RIM 900 to indicate that it is ready to receive data from the
computing device. When this line is high, any data sent from the computing
device to the RIM 900 may be lost. This is a flow control mechanism that is
normally reacted to by the UART in your serial communication system.
When the radio is turned off, this line will be low from inside the radio modem
with an impedance of at least 20 k
:.
Pin 16 ~RTS ~Request To Send
This line is an input to the radio. Its active (request to send) state of this line is
low.
All MASC implementations require this line. This line is optional for RAP
implementations. Connect ~RTS to ground if your application does not require
it.
This is an input to the RIM 900 from the computing device. This line should be
asserted low by the computing device to indicate that it is ready to receive data
from the RIM 900. This is a flow control mechanism that is normally handled
by the UART in your serial communication system.
Pin 17 ~DSR ~Data Set Ready
This line is an output from the radio.
The active (data set ready) state of this line is low.
When the RIM 900 is off, this line will be low from inside the radio modem
with an impedance of at least 20 k
:.output from the RIM 900 that indicates the
state of DTR.
Pin 18 GND Ground
This line should be tied to the system ground of the host unit to ensure proper
operation.