ABB NextMove e100 User Manual

MN1941WEN Input / Output 4-23
Figure 22: RS232 serial port connections
4.5.4 Multidrop using RS485 / RS422
Multidrop systems allow one device to act as a ‘network master’, controlling and interacting
with the other (slave) devices on the network. The network master can be a controller such
as NextMove e100, a host application such as Mint WorkBench (or other custom
application), or a programmable logic controller (PLC). RS422 may be used for multi-drop
applications as shown in Figure 23. Four-wire RS485 may be used for single point-to-point
applications involving only one controller. If firmware is updated over RS485/RS422, it can
only be downloaded to the controller that was chosen in the Select Controller dialog in Mint
WorkBench.
Figure 23: 4-wire RS422 multi-drop connections
Each transmit/receive (TX/RX) network requires a termination resistor at the final RX
connection, but intermediate devices must not be fitted with termination resistors. An
exception is where repeaters are being used which may correctly contain termination
resistors. Termination resistors are used to match the impedance of the load to the
impedance of the transmission line (cable) being used. Unmatched impedance causes the
RXD 2
TXD 3
GND 5
2RXD
3TXD
5GND
RTS 7
CTS 8
7RTS
8CTS
NextMove e100
(DTE)
9-pin
Computer
COM port
(DTE)
Connect overall shield
to connector backshell
Serial
COM
T
R
RXB
DGND
RXA
TXA
BXRBXT
DGND
RXA
TXA
TXB
RXB
DGND
RXA
TXA
TXB
T
R
Network
master
Network slave
Network slave
Connect overall shield to
connector backshell
Master and final slave are shown
with terminating resistors, T
R
typical value 120 Ω.
Twisted pairs

ABB NextMove e100 Specifications

General

Brand	ABB
Model	NextMove e100
Category	Controller
Language	English