B.2 connection using a null modem cable – Campbell Scientific MD485 RS-485 Multidrop Interface User Manual
Page 32
Appendix B. RF401 to MD485 Network
MD485 Configuration
a. Base MD485
1) Active Ports – “CS I/O and RS-485”
2) Communication Mode – “MD9 Emulation” with address 255
3) CS I/O Port Configuration – “Modem to Modem w/o Datalogger”
4) RS-485 Port Configuration – Desired baud rate
b. Remote
MD485s
1) Active Ports – “CS I/O and RS-485”
2) Communication Mode – “MD9 Emulation” with address 1, 2,
etc. (unique for each remote MD485 and must agree with
respective MD9 in device map)
3) CS I/O Port Configuration – Modem Enable
4) RS-485 Port Configuration – Desired baud rate
RF401 Configuration
The RF401s may be left in their default settings. However, if there is a
neighboring RF401 network, you should change the Hopping Sequence of
base and remote RF401s to a new setting to avoid interference.
4. HARDWARE
After configuring LoggerNet or PC208W, the RF401s and the MD485s
you are ready to set up hardware. Connect the base RF401 RS-232 port to
the PC COM port. The A100 null modem connectors (it’s not important
which connector goes to which unit) connect via SC12 cables to the CS
I/O ports of the remote RF401 and the base MD485. Connect power to
the PS100. When you turn on the PS100 supply, the MD485 receives
12V power and you will see the LEDs light in their power-up sequence.
Remote MD485s normally connect to datalogger CS I/O ports via SC12
cables. Powering up the datalogger will start the MD485 operating.
Connect the CABLE2TP cable between the RS-485 ports of the base and
remote MD485s and you are ready to connect to the datalogger.
B.2 Connection using a Null Modem Cable
The RF401 to MD485 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 MD485 and one with
RF401)
f. CABLE2TP
B-4