User's Manual

10 Getting started – Test board overview
Integrator’s Guide – RIM 902M OEM Radio Modem
Test board overview
The RIM test board provides a standard RS-232 serial interface between a PC
and the radio modem. It is designed to help you quickly interface the
RIM 902M to a standard PC (through a COM port) or a terminal device with
an RS-232 serial port. The test board also provides access points to the radio’s
serial communication port, which allows you to monitor activity with a logic
probe, multimeter, or oscilloscope.
The test board includes the following components and functionality:
RS-232 interface
The serial (COM) port on a PC and most terminal devices operates at RS-232
signal levels, which are typically r 12V. This high voltage would damage the
RIM 902M, which is typically integrated into a device that operates an
asynchronous serial port at 3.0V. The RS-232 interface on the test board allows
you to produce an output from the radio that is easily interpreted by a PC.
Test points
The test board is more than just an RS-232 interface. It also features debugging
facilities to help you test your application. It provides direct access to each of
the 22 pins on the serial data cable, which allows connectivity to analytical
equipment (e.g. logic probe, multimeter, or oscilloscope) and real-time
indication of data flow.
On/off switch
With the switch in the ON position, the radio will turn on whenever power is
applied to the test board. When the switch is moved to the OFF position, the
radio will shut down.
Power supply
The RIM 902M must be provided with a clean, high-current power source. In
this case, we use a standard plug-pack to provide the current necessary to