American Fibertek MRX-480 - Manual (Page 5)

5
DATA INPUT / OUTPUT CONNECTIONS
Data input and output connections are made via terminal blocks on the right side of the unit. For
RS485, RS422, and Manchester data, please follow the label on the unit for proper orientation of the
data connections. Please note RS485 2-wire data uses the two terminals labeled DATA IN. For RS232
data please see the drawing below for proper orientation of the input and output connections.
For all formats with the exception of 2-wire RS485, DATA OUT on the MRX-480 becomes DATA IN on
the MTX-480 or RTX-480 after going across the fiber. The reverse flow follows the same orientation.
For 2-wire RS485 format data flows through DATA IN on both ends.
TYPICAL SYSTEM DATA CONNECTIONS
The RS422 or RS485 four wire interconnection between the MRX-480 and the copper device to which it
is attached is based on industry standard EIA terminology for the transmission of electronic data
signals. Using this terminology, the driver of an electronic signal is labeled TX or Data Out.
Correspondingly, the receiver of an electronic signal is labeled RX or Data In. Following this standard,
the Data Out of the copper device is connected to the Data In of the MRX-480. The plus terminal of the
copper device is connected to the plus terminal of the MRX-480 and the minus is connected to the
minus. The reverse flow of data from the MRX-480 to the copper device follows the same pattern. Not
all manufactures follow standard EIA terminology. Consult the installation instructions for your copper
device if you are unsure which two wires are the drive (data out) wires and which two wires are the
receive (data in) wires.
DATA CONFIGURATION
NOTE: This unit is shipped with the data channel in the RS485 4-wire configuration.
For other data configurations please refer to the drawing below for changes to the default switch
settings of switch bank S1. These configuration switches are located on the left side of the unit and can
be modified without opening the unit.