User manual

Radiocrafts
Embedded Wireless Solutions
RC-IESM-Series
2010 Radiocrafts AS RC-IESM User Manual (rev. 1.20) Page 5 of 14
Functional Layout
The ARM9 processor connects to the IESM board via a 50-pin GPC, General Purpose
Connector, mounted on the secondary side of the board. The antenna connector is a
standard SMA connector.
Figure 2: IESM board functional connection
Antenna connection
A quarter wave antenna can be directly connected to the SMA antenna connector. If the
modem is placed in environments where RF performance is reduced, an external antenna
can be connected via an extension coaxial cable to the SMA connector. It is strongly
recommended that the Sierra Wireless GPRS antenna and the IESM antenna is not pointing
in the same direction to reduce possible interference and range reductions; Thus, use angled
GPRS antenna if straight antenna is used with the IESM card, and vice versa.
GPC, General Purpose Connector, Pin Description
Pin no
Pin name
Description
and internal MCU connection
1-2 GND System ground
3-15 NC Not Connected
16 GPIO28 Reset_N
17-22 NC Not Connected
23 RXD2 Connects to the module’s RXD-pin
24 TXD2 Connects to the module’s TXD-pin
25 CTS2 Connects to the module’s CTS-pin
26 RTS2 Connects to the module’s RTS-pin
27-28 NC Not Connected
29 GPIO19 Push Button
30 NC Not Connected
31 GPIO20 LED (green)
32 NC Not Connected
33 GPIO23 Config (enable module configuration mode)
34 NC Not Connected
35 DTR1 Pull-up to pin 41
36-40 NC Not Connected
41 VCC-2V8 Used for board-internal pull-up
42 GND System ground
43-44 NC Not Connected
45 GND System ground
46-47 4V Connected to modules VCC pin via on-board Low Dropout Regulator
48-50 GND System ground