Installation
28 Rev. E2 04/2011 Marathon MR
Adjustable baud rate only available through 2-way RS485.
To set up your computer to initialize the sensors, complete the following steps:
1. Remove power from the MR sensor!
2. Install all electronics wiring!
3. Plug the RS232/485 interface converter into your computer’s serial port, or attach it to a serial
cable connected to the computer! Use 9 pin to 25 pin converter if necessary!
4. If the 9 VDC power supply is used, apply power to the RS232/485 converter!
5. Apply power to the MR sensor!
6. Turn on your computer!
You need to make sure another serial device (e.g. an internal modem) is not using the
identical COM-port at the same time!
Always make all electrical connections before applying power to the MR sensor! Do not
change RS485 or power connections on the RS232/485 converter while the MR sensor has
power applied, as this may cause damage to the Interface converter!
In 4-wire communication the data can be transferred in both directions, from sensor to PC and reverse.
4-wire communication should be preferred compared to 2-wire communication (for 2-wire
communication see appendix 11.4 2-Wire Communication, Seite 57).
For an installation of two or more sensors in a network, each sensor cable is wired to its own terminal
block. The RS485 terminal lines on each terminal block are wired in parallel.
Figure 19: 4-Wire Multidrop Wiring in a Network
from additional terminal block
of another sensor
9 VDC power ... or 24 VDC power supply
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