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LNL-1100 Input Control Module
44.2
Installing Jumpers
The following diagram describes the use of each jumper on the board. The jumper is indicated by
brackets [ ]. The default shipping position is shown below.
The (EIA) Electronic Industries Association standard defines RS-485 as an electrical interface for multi-port
communications on a bus transmission line. It allows for high-speed data transfer over extended distances
(4000 feet/1219 m). The RS-485 interface uses a balance of differential transmitter/receiver to reject
common mode noise. For increased reliability over the extended distances, End-Of-Line (EOL) termination
is required.
RS-485 (2-wire or 4-wire) must be terminated at both ends of the RS-485 line (bus). Terminating the line
provides a more reliable communication by minimizing the signal reflection and external noise coupling.
Each component provided has an on-board terminator. The installer should determine which device is at the
end of the communication line.
276 —
revision 7
TB1
I1
I1
I2
I2
TB 2
I3
I3
I4
I4
TB 3
I5
I5
I6
I6
TB4
I7
CT
I7
BA
I8
I8
TB 9
CT
G N D
BA
G N D
J9
J1
J2
TB 10
TR+
2W
4W
TR-
J3
R+
R-
G N D
TB 11
VIN
G N D
[J1]
RS-485 termination. Install
in first and last units only.
OFF: Termination is not on
ON: Termination is on
1
9
2
1 0
1 1
3
1 2
4
1 3
5
1 4
6
1 5
7
1 6
8
J4
J7
J5
J6
S1
J8
[J3]
2-wire select: install
in 2W position only.
J 3
TB 5
I9
I9
I1 0
I1 0
TB 6
I1 1
I1 1
I1 2
I1 2
TB 7
I1 3
I1 3
I1 4
I1 4
TB 8
I1 5
I1 5
I1 6
I1 6
TB 12
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