Campbell Scientific MD485 RS-485 Multidrop Interface - Manual (Page 45)

Appendix D. Digital Cellular Modem to
MD485 Network
It is possible to access an MD485 network via a digital cellular modem when
the network is miles from the PC (see Figure D-1). Although hardware
requirements are similar, the LoggerNet setup for our RavenXT-series,
Raven100, and Raven110 digital cellular modems is different than the
LoggerNet setup for the Redwing100 and Redwing105 digital cellular
modems.
CS I/O
Digital Cellular Modem
RS-232 Null Modem Cable
To
Power
Supply
To
RS-485
To
Wall
Transformer
Network
FIGURE D-1. Digital Cellular Modem to MD485 Conversion
D.1 RavenXT-series, Raven100, and Raven110 Digital
Cellular Modems
Where a RavenXT-series, Raven100, or Raven110 digital cellular modem to
MD485 base is desired, the following configurations will provide
communications in transparent mode, with MD9 Emulation or PakBus
Networking.
1. HARDWARE REQUIREMENTS
a. MD485s
b. RavenXT-series, Raven100, or Raven110 digital cellular modem
c. Transformer (CSI Item #15966)
d. Null modem cable (CSI Item #18663)
e. SC12 cables (one included with each MD485)
f. CABLE2TP
cable
D-1