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TYPICAL SYSTEM DATA CONNECTIONS
The RS422 or RS485 four wire interconnection between the MT-984C-SL 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 TX or Data Out of the copper device is connected to the RX or Data In of the MT-984C-SL. The
plus terminal of the copper device is connected to the plus terminal of the MT-984C-SL and the minus
is connected to the minus. The reverse flow of data from the MT-984C-SL 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 received (data in) wires.
DATA CONFIGURATION
The MT-984C-SL is factory shipped with the data channel configured in the 4-wire RS485 mode.
See table below for a summary of switch settings.
Data Switch Off=Up On=Down
1
2
Off
Off
On
Off
Off
On
On
On
MT-984C-SL STATUS INDICATORS
The MT-984C-SL transmitter provides the following LED status indicators to aid in installation and
troubleshooting:
DATA TX
A green LED indicator is provided to monitor input data from the electrical interface, through the MT-
984C-SL, and out onto the fiber. The intensity of this indicator will vary with input data patterns.
However, in typical applications it will cycle on and off as data is transmitted. Data status associated
with this LED is summarized below.
Data TX LED
Green
Off
DATA RX
A green LED indicator is provided to monitor the data coming in from the fiber, through the MT-984C-
SL, and out onto the electrical interface. The intensity of this indicator will vary with input data patterns.
However, in typical applications it will cycle on and off as data is received. Data status associated with
this LED is summarized below.
Data RX LED
Green
Off
3
Off
On
Off
On
Data Status
Data Flow Present
Data Flow Not Detected
Data Status
Data Flow Present
Data Flow Not Detected
4
5
Off
Off
Off
Off
On
Off
On
Off
5
RS485-4W/Manchester
RS485-2W
RS422
RS 232
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