Campbell SAT ARGOS Bedienungsanleitung Seite 97

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Seitenansicht 96
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 89
connect and communicate at 4800 BPS. This can be accomplished in two ways: (1) either through direct
connection between your computer and the cellular modem, or (2) using the ZENO
®
-3200's Passthrough
Mode
110
. The following table shows how you should set up your terminal emulation program or
ZENO
®
-3200's Passthrough Mode in order to communicate with a cellular modem:
Serial Port Setting Value for Cellular
Modem Comm.
Baud Rate 4800
Data Bits 8
Start Bits 1
Stop Bits 1
Parity None
Flow Control None
Selection of antenna, antenna location, and RF coaxial cable (typically 50-
ohm impedance) all play significant roles ensuring a reliable cellular link.
If your signal strength is less than –90 dBm (-90 dBm through –120 dBm) you are in an area of low
signal strength and may experience high bit error rates. Such conditions can be eliminated through proper
antenna location or use of higher gain antenna technology.
Coastal Environmental Systems recommends use of a directional or omni-
directional antenna with at least 3-dB gain.
Coastal Environmental Systems also recommends using RG-8 Low Loss
coaxial cables for any cable run longer than ten feet.
Cellular modems typically operate within the 800 – 900 MHz frequency
range.
The ZENO
®
-3200 data logger can be used with two types of stand-alone cellular modems:
AMPS (Advanced Mobile Phone System)
CDPD (Cellular Digital Packet Data)
Coastal Environmental Systems uses two different cellular modems to support the two cellular modem
types that are:
110
Refer to Section 6.9.
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