Campbell Scientific NL100 Network Link Interface - Manual (Page 25)

NL100/105 Network Link Interface
3.2.2 MD9 Connection from NL100/105 to Datalogger
Campbell Scientific's MD9 Multidrop Interface can be used to connect one or
more dataloggers to the NL100/105 via the NL100/105’s RS-232 port. A
multidrop network is capable of addressing up to 254 dataloggers, but the
actual number of dataloggers that can be connected depends upon attenuation
of the signal due to coax cable length, the number of devices on the network,
and the number of coax terminator pairs used. Refer to the MD9 manual for
determining the maximum number of dataloggers that can be connected based
on these factors.
An SC532 or SC532A Interface device should be connected to the serial port
of the NL100/105. The cable to an SC532 should be a standard 9 to 25 pin RS-
232 cable, with the 25 pin male connection mated to the RS-232 side of the
SC532. The cable to an SC532A should be a standard 9 to 9 pin RS-232 cable.
Note, however, that the RTS line in the cable must be disabled (pin 7 on the 9-
pin connector or pin 4 on the 25-pin connector). An SC12 cable is used to
connect the 9 pin peripheral connection of the SC532/SC532A to the serial I/O
port of the MD9. Coax cable, running from the coax port of the base MD9, is
run to each of the remote MD9 devices, which are connected to the dataloggers
with SC12 cables. Refer to the MD9 User's Manual for additional information.
The Setup window in LoggerNet should depict an MD9 Base modem attached
to the IPPort, with the datalogger attached to an MD9Remote Modem. Refer to
Figure 4 below.
FIGURE 4. LoggerNet Setup for NL100/105 to MD9 to Datalogger Connection
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