Campbell Scientific COM200 Telephone Modem - Manual (Page 9)

COM200 Telephone Modem
3
Table 1. Dataloggers that Require Direct
12 VDC Connection to COM200
CR10(X) w/ silver wiring panel
CR10(X) w/ black CR10 wiring panel (P/N 8032)
21X(L)—serial number 13,442 or lower
CR500

serial number 1764 or lower
CR7—700X serial number 2778 or lower
BDR301 and BDR320
3.2 Connecting to Earth Ground
Connect the green 14 awg grounding wire (provided with the COM200) to the
grounding terminal (GND) on the COM200 and to the enclosure’s earth
ground connection. If the site does not have a grounded enclosure, then
connect the ground wire directly to an earth ground connection. The
datalogger ground should also be tied to the earth ground.
The modem must be grounded for its transient protection to
work.
3.3 Telephone to MD9 or Telephone to RF Systems
Telephone to MD9 or telephone to radio systems can be utilized for
communicating with multiple dataloggers through one telephone line. Nothing
additional or special is required for the telephone part of the link. See the
MD9 or RF Manuals for complete information on their special requirements.
3.4 Telephone Service
The goal of the telephone company is to provide you with the best service it
can. In order to do this, it may occasionally be necessary for them to make
changes in their equipment, operations, or procedures. If you have any
questions about your telephone line, such as how many pieces of equipment you
can connect to it, the telephone company will provide this information upon
request. If the telephone company requests information concerning the
equipment which you have connected to your telephone line, the FCC
registration number and the ringer equivalence number (REN) of the COM200
are listed on it’s label. Additional technical information from the FCC and IC
on the COM200 is available in Appendix D and E, respectively.
CAUTION