Yaskawa Remote Display Unit RDU for use with MicroTrac DSD LAN - Manual (Page 4)

4
NOTE
Up to 5 RDUs can be daisy chained
to receive +5VDC from a Remote
Power Supply, MagneTek part no.
05P00090-0259.
REMOTE DISPLAY CONTROLLER LAN
NODE PCB (RDC) RS-485 INTERCONNECT
The RDC communicates with the
RDU through use of an RS-485 bidirectional
serial data bus. The RS-485 serial
communications take place on differential
signal lines, the signal and its inverse. Each
extreme of the serial bus must be
terminated with a 120 ohm resistor
between the differential lines (for a total
of 2 resistors regardless of the number of
RDUs). The terminator will reduce
reflections in the signal lines (reflections will
cause invalid communication). There are 3
terminals provided on the RDU for
connection to the RS-485 bus:
TB1
PIN # NAME DESCRIPTION
6 LINE A This is the RS-485
inverted signal.
5 LINE B This is the RS-485
non-inverted signal.
4 COMMON This is the Digital
common used for the
+5V ground return
path. It may be used
as a shield connec-
tion if so desired.
The maximum length of the RS-485
bidirectional serial data bus, from one
extreme to the other, must not exceed 4000
feet. Twisted pair wiring should be used to
carry the signals LINE A and LINE B.
KEYPAD INTERCONNECT
A 4 x 5 local matrix keypad
(MagneTek part no. 46S02880-0010) may be
connected to the RDU. The connections are
to be made as follows:
KEYPAD RDU CONN
CONNECTOR J2 PIN #
G 1
H 2
J 3
K 4
L 5
M 6
N 7
P 8
Q 9
CHANNEL SELECT
The RDU gets its channel number
from a rotary channel select switch and a
channel range terminal which are accessed
from the rear of the RDU. The range of RDU
channel numbers is 0 through 31. The RDU
channel number is selected as follows:
WITH TB1(3) WITH TB1(3)
OPEN SHORTED TO
COMMON (TB1(2))
CHANNEL S1 CHANNEL S1
NUMBER SETTING NUMBER SETTING
0 ∆ 0 16 0
1 1 17 1
2 2 18 2
3 3 19 3
4 4 20 4
5 5 21 5
6 6 22 6
7 7 23 7
8 8 24 8
9 9 25 9
10 A 26 A
11 B 27 B
12 C 28 C
13 D 29 D
14 E 30 E
15 F 31 F
∆
For performing RCDU self-
diagnostics only; not a valid
selection for normal operation.
RD 791-10