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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)
1.
Section 3.2
2.
3.
4. one pair of wires