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1
COM200A TELEPHONE MODEM
1. INTRODUCTION
1.1 GENERAL DESCRIPTION
The COM200A Modem is a 9600/1200 baud
modem employing the Hayes AT command set.
Its primary use is as a remote site modem
connected to a CSI datalogger. The modem is
powered and enabled by the battery-powered
datalogger. When not active, the COM200A
draws less than 120
µ
A from the datalogger’s
12 VDC output.
The COM200A is connected to a CSI
datalogger by using a 9-pin subminiature D
connector cable. This is the same 9-pin CS I/O
connection common to all Campbell Scientific
products. This is not an RS-232 connection.
Appendix B
describes the configuration of this
connector.
The COM200A can be used as an originate
modem at the datalogger site. To originate a
call to the computer, the datalogger is
programmed using Instruction 97. Instruction
97 is described in detail in the datalogger
manual.
1.2 COMPUTER REQUIREMENTS
A Hayes compatible modem is used at the
computer site with Campbell Scientific computer
software to call the datalogger attached to the
COM200A. The computer’s modem must be
configured to the proper settings using the
modem initialization strings listed in the
software programs.
To communicate at 9600 baud, the calling
modem’s error correction must be enabled. If
your modem initialization string has an
&Q0
,
you will need to change it to an
&Q5
in order to
enable the error correction. You must continue
to use your old string for any communication at
1200 baud.
2. SPECIFICATIONS
•
Bell 212A, CCITT V.22, and CCITT V.32
compatible
•
Full duplex at 9600 and 1200 baud to
datalogger
•
V.42 LAPM and MNP2-4 error correction
•
Hayes AT command set
•
RJ-11C telephone jack
•
Australia ACA compliant
•
Pulse or tone dialing
•
Current drain: 120
µ
A quiescent, 140 mA
active
•
Direct connection to and powered by CSI
dataloggers
•
Supply requirements: 12 VDC regulated
power supply
•
Internally switches 12 VDC external power
minimizing current drain
•
Logic levels: below 1.5 V inputs a low state
and above 3.5 V inputs a high state. A low
voltage level on the TX data input (pin 9)
and RX data output (pin 4) represents a
mark
•
Operational temperature: -25
o
C to +50
o
C
•
Size: 5.2” x 1.7” x 3.6” // 13.1 x 4.3 x 9.2 cm
•
Weight: 0.75 lbs // 0.34 kg
Содержание COM200A
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