Integrator's Manual GR47/GR48

8. HINTS FOR INTEGRATING THE RADIO DEVICE
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LZT 123 7589 R1A
• If you intend to use SMS in the application, ensure this is included in
your (voice) subscription.
• Consider the choice of the supplementary services described in section
2.3.2 Short Message Service, page 10.
8.2.2 How to Install the Radio Device
Power Supply
• Use a high-quality power supply cable with low resistance. This ensures
that the voltages at the connector pins are within the allowed range,
even during the maximum peak current. An electrolytic capacitor
should be placed close to the power supply pins of the radio device to
supply the peak currents during burst transmission. See 5.4 VCC -
Regulated Power Supply Input, page 23.
• See section 5.2.1 General Protection Requirements, page 22.
Grounds
A ground connection is provided at the mounting hole next to the RF
connector on the radio device (see Figure 5.1, page 19). Connect this
ground point to the DGND pins of the radio device by the shortest, low-
impedance path possible. The purpose of this connection is to allow any
ESD picked up by the antenna to bypass the radio device’s internal ground
path.
1RWH It is recommended that you use a cable with a maximum resistance of 5 mΩ
for the ground connection.
1RWH AGND and DGND are connected at a single point inside the radio device.
They must not be joined together in your application.
Audio
Use a coupling capacitor in ATMS line if the application does not use the
radio device’s bias voltage. See also Figure 5.5 Microphone connections to
the radio device, page 31.
Software Upgrade
To upgrade the software, the system connector must be accessible in your
application. The pins SERVICE, TD2, RD2 and the power signals are used
for this purpose. Please contact customer support for more details.