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Appendix E
485 Multi-Drop Connection
RS
MASTER
DEVICE
N OTE
:
1.
TERMINATION JUMPER (J6), LOCATED ON THE MODBUS
CARD, MUST BE CONNECTED ON THE LAST SLAVE IN THE
CHAIN. (REFER TO FIGURE 3 FOR JUMPER POSITIONS)
2.
A MAXIMUM OF 247 SLAVES CAN BE ADDRESSED ON
THE MODBUS NETWORK.
3.
RECOMMENDED TWISTED PAIR WIRE IS BELDEN 8471,
16 AWG (ABB ZENITH PART # WMW-453).
4.
FOLLOW STANDARD RS485 WIRING (INSTALL A REPEATER
IF THE WIRE LENGTH EXCEEDS 4,000 FT. OR FOR EVERY 32
DEVICES ON THE NETWORK).
ABB Zenith
I
A
B
MX150/MX250 Series Modbus Network Card (71R-2200)
MX150/250
WITH
MODBUS
CARD
SLAVE #1
A
B
MX150/250
WITH
MODBUS
CARD
SLAVE #2
A
B
MX150/250
WITH
MODBUS
CARD
SLAVE #3
A
B
SEE NOTE 1
17
I
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