Figure 2-17 Rs422/485/Modbus Communications Option Connections - Honeywell UDC 3300 Product Manual

Communications option
connections
Figure 2-17
CAUTION
Do not mix half and
full duplex wiring.
Use shielded twisted pair cables
1
(Belden 9271 Twinax or equivalent)
30
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)
RS422/485/Modbus Communications Option Connections
MODBUS OR
RS422/485
L1
HALF DUPLEX
L2/N 12
SHD
22 13
TX+/RX+
23 14
TX–/RX–
24
15
25 16
26 17
27
MODBUS OR
L1
FULL DUPLEX
L2/N 12
SHD
22 13
RX+
23 14
RX–
24
15
TX+
25 16
TX–
26 17
27
UDC 3300 Controller Product Manual
SHD
1
TX+/RX+
TX–/RX–
To Other
Do not run these
Communication
lines in the same
Instruments
conduit as AC power
(maximum 15)
120 Ohm Resistor
on Last Leg
RS422/485
1
SHD
TX+
TX–
RX+
RX–
Do not run these
To Other
lines in the same
Communication
conduit as AC power
Instruments
120 Ohm Resistor
(maximum 15)
on Last Leg
Master
120 Ohm
Resistor
Master
120 Ohm
Resistor
120 Ohm
Resistor
24169
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