15
CHAPTER 4: Installation
2) It is not necessary that the RS-485 device adhere to the RS-530
standard. However, you must make sure that the signals, polarities, and
pairing of your connection conform to this table.
3) If you are not using two IC477A-X-R2s or IC478A-X-R2s back to back
and the procedure on the previous page produces garbage data (or none
at all), flip the “A” and “B” leads at one end of the 485 connection.
4.1.2 4-W
IRE
C
ONNECTION
U
SING
T
ERMINAL
B
LOCKS
(IC476A-X-R2)
If your RS-485 application requires you to connect two pairs of bare wires
to the Converter, you will need to open the case to access the terminal
blocks. The following instructions tell you how to connect the bare wires to
the terminal blocks and fasten the strain-relief collar in place so that the
wires won’t pull loose.
1.
You should already have the case open for the configuration procedure.
If not, open the case as described in
Section 3.2
.
2.
Strip the outer insulation from the twisted pairs about one inch from the
end.
3.
Strip back the insulation on each of the two twisted-pair wires about one
eighth of an inch.
4.
Connect
one pair of wires
to XMT+ and XMT- on the terminal block,
making careful note of which color is positive, and which color is negative.
