Campbell Scientific MD485 RS-485 Multidrop Interface - Manual (Page 40)

Appendix C. MD485 to RF401 Network
When you turn on the PS100 supply, the MD485 and the RF401 receive
12V power and you will see the LEDs light in their power-up sequence.
The remote RF401 connects to datalogger CS I/O port via an SC12 cable.
Powering up the datalogger will start the RF401 operating.
Connect the two twisted pair, shielded cable between the RS-485 ports of
the base and remote MD485s and you are ready to connect to the
datalogger.
C.2 Connection using a Null Modem Cable
The MD485 to RF401 conversion can be done using a null modem cable in
place of the PS100/A100. The following configurations will provide
communications in transparent mode, MD9 Emulation or PakBus Networking.
1. HARDWARE REQUIREMENTS
a. MD485s
b. RF401s
c. Three transformers (CSI Item #15966)
d. Null modem cable (CSI Item #18663)
e. Three SC12 cables (one included with each RF401 and one with
MD485)
f. CABLE2TP cable
2. TRANSPARENT COMMUNICATION (POINT-TO-POINT)
PC-MD485----MD485--null modem--RF401---RF401-DL
LoggerNet Setup
a. Setup:
ComPort_1
PakBus Port (PakBus dataloggers only)
CR1000
b. ComPort_1 – default settings
c. PakBus Port – defaults (PakBus dataloggers only)
d. CR1000 – default settings, schedule collections as desired
MD485 Configuration
a. Base MD485
1) Active Ports – “RS-232 and RS-485”
2) Communication Mode – “Transparent Communication”
3) RS-232 Port Configuration – Desired baud rate
4) RS-485 Port Configuration – Desired baud rate
C-4