Figure 2-15 Rs422/485/Ascii Or Modbus Communications Option Connections - Honeywell DC33XB User Manual

Communications Option
The Communications option is available for RS422/485/ASCII or Modbus (Model
DC330X-XX-1XX or DC330X-XX-5XX)—refer to Figure 2-15.
ASCII or MODBUS
RS422/485
HALF DUPLEX
CAUTION
Do not mix half and
full duplex wiring.
ASCII
RS422/485
FULL DUPLEX
1 Use shielded twisted pair
cables (Belden 9271
Twinax or equivalent)

Figure 2-15 RS422/485/ASCII or Modbus Communications Option Connections

12/00
SHD
13
TX+/RX+
14
TX–/RX–
15
To Other
Communication
Instruments
(maximum 31)
SHD
13
RX+
14
RX–
15
TX+
16
TX–
17
To Other
Communication
Instruments
(maximum 31)
UDC3300 Basic Model: DC33XB User Manual
Master
1
SHD
TX+/RX+
TX–/RX–
Do not run these lines in
the same conduit as AC
power
120 Ohm Resistor
on Last Leg
Master
1
SHD
TX+
TX–
RX+
RX–
120 Ohm Resistor
on Last Leg
Installation
120 Ohm
Resistor
120 Ohm
Resistor
120 Ohm
Resistor
15