Communications option There are two types of Communications option available:

connections

RS422/485/Modbus (Model DC330X-XX-1XXor 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

 

 

MODBUS OR

 

 

L1

 

RS422/485

 

 

 

HALF DUPLEX

 

 

 

 

Master

 

L2/N

12

 

 

 

 

 

SHD

 

22

13

SHD

1

 

 

 

 

 

TX+/RX+

 

23

14

TX+/RX+

 

120 Ohm

TX–/RX–

 

TX–/RX–

24

15

 

Resistor

 

 

 

 

25

16

 

 

 

 

26

17

 

 

 

 

27

 

 

 

 

 

 

 

To Other

Do not run these

CAUTION

 

Communication

lines in the same

 

Instruments

conduit as AC power

Do not mix half and

(maximum 15)

120 Ohm Resistor

full duplex wiring.

 

 

on Last Leg

 

 

 

 

 

MODBUS OR

L1

 

RS422/485

 

FULL DUPLEX

L2/N

12

 

1

 

 

SHD

22

13

 

 

 

23

14

RX+

 

 

 

24

15

RX–

 

TX+

 

25

16

 

 

 

26

17

TX–

 

 

 

27

 

 

 

 

Master

SHD

 

TX+

120 Ohm

TX–

Resistor

RX+

120 Ohm

RX–

Resistor

 

1Use shielded twisted pair cables (Belden 9271 Twinax or equivalent)

To Other

Communication Instruments (maximum 15)

Do not run these lines in the same conduit as AC power

120 Ohm Resistor

 

on Last Leg

24169

30

UDC 3300 Controller Product Manual

4/00

Page 42
Image 42
Honeywell UDC 3300 manual Master L2/N, Tx-/Rx, Do not mix half, Full duplex wiring