Campbell Scientific MD485 RS-485 Multidrop Interface - Manual (Page 37)

Appendix C. MD485 to RF401 Network
Where an MD485 to RF401 network is desired, the following configurations
will provide access to an RF401 network via MD485s.
The connection between the remote MD485 and the base RF401 can be made
in two different ways. 1) Using a Campbell Scientific PS100 Power Supply
with A100 Null Modem Adapter. The PS100 provides 5 and 12 volts for
system operation and the A100 performs the function of a null modem (the
RF401 and MD485 are both "modem" devices). 2) Using a null modem cable
and transformers to provide power to the RF401 and the MD485.
The following sections will describe how to set-up the MD485 to RF401
network using each of these two methods for each communication mode.
C.1 Connection using a PS100 with A100
Figure C-1 shows an MD485 to RF401 network using a PS100 with A100.
The following configurations will provide communications in transparent mode
or with MD9 emulation. Connection to a single PakBus datalogger is possible
with transparent communication. PakBus Networking is not possible using the
PS100/A100, but can be done using a datalogger in place of the PS100/A100
for routing.
RS-485
+12V PS100 12V POWER SUPPLY
A100
Null Modem Port
Adapter
WITH CHARGING REGULATOR
MADE IN USA
WARNING:
PERMANENT DAMAGE TO
RECHARGEABLE CELLS MAY RESULT IF DISCHARGED BELOW 10.5 VOLTS
+12V
BATTERY - INTERNAL (12V 7 AMP HOUR)
LIFT TO REMOVE
BATTERY - EXTERNAL RECHARGEABLE BATTERY
CHARGE - CHARGING VOLTAGE PRESENT
OFF ON - POWER TO 12V TERMINALS
CHARGE
CHARGE FROM CHARGER OR SOLAR PANEL 16-28VDC OR 18VAC RMS TO EITHER TERMINAL, TO OTHER
POWER TO DATALOGGERS OR 12V PERIPHERALS
Logan, Utah
RS-232
To
Wall
Transformer
To Wall Transformer
CS I/O
CS I/O
CS I/O
FIGURE C-1. MD485 to RF401 Conversion
C-1