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30 UDC 3300 Controller Product Manual 4/00
Communications option
connections
There are two types of Communications option available:
• RS422/485/Modbus (Model DC330X-XX-1XX or
DC330X-XX-5XX)—Figure 2-17 [also refer to Document
#51-51-25-35 (RS422/485 ASCII) or #51-52-25-66 and #51-52-25-70
(Modbus)]
• DMCS (Model DC330X-XX-4XX)—Figure 2-18 (also refer to
Document #82-50-10-23)
Figure 2-17 RS422/485/Modbus Communications Option Connections
12
13
14
15
16
17
L1
L2/N
22
23
24
25
26
27
Master
TX+
SHD
TX–
RX+
RX–
Do not mix half and
full duplex wiring.
Do not run these
lines in the same
conduit as AC power
CAUTION
12
13
14
15
16
17
L1
L2/N
22
23
24
25
26
27
Master
TX–/RX–
SHD
TX+/RX+
Do not run these
lines in the same
conduit as AC power
MODBUS OR
RS422/485
HALF DUPLEX
To Other
Communication
Instruments
(maximum 15)
SHD
TX+/RX+
TX–/RX–
MODBUS OR
RS422/485
FULL DUPLEX
RX+
SHD
RX–
TX+
TX–
120 Ohm
Resistor
To Other
Communication
Instruments
(maximum 15)
120 Ohm Resistor
on Last Leg
120 Ohm
Resistor
120 Ohm
Resistor
120 Ohm Resistor
on Last Leg
24169
1
1
1
Use shielded twisted pair cables
(Belden 9271 Twinax or equivalent)