American Fibertek RT-915C - Manual (Page 4)

4
DATA INPUT / OUTPUT CONNECTIONS
Data input and output connections are made via terminal blocks on the back of the unit. See the
drawings below for proper orientation of the input and output connections for Data Channel 1.
TYPICAL SYSTEM DATA CONNECTIONS
The RS422 or RS485 four wire interconnection between the RT-915C 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 RT-915C. The plus terminal of the
copper device is connected to the plus terminal of the RT-915C and the minus is connected to the
minus. The reverse flow of data from the RT-915C 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.
CONTACT CLOSURE INPUT / OUTPUT CONNECTIONS
Contact Closure input and output connections are made via the bottom (DATA 2) terminal block on the
back of the unit. See the drawing below for proper orientation of input and output connections. Please
note that the far right pin on the connection drawing corresponds with the far right pin when looking at
the terminal block from the back of the unit.
DATA CONFIGURATION
NOTE: This unit is shipped in the following default configuration.
Channel 1: RS485 (4 wire) data
Channel 2: Contact Closure (dry)
For other configurations of Channel 1, please refer to the drawing below for changes to the default
switch settings. These configuration switches are located on the left side of the unit and can be
modified without opening the unit.