Page 6–6 Stellar
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SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
Chapter 6: Accessories
serial modbus CommuniCaTion spliTTer – opTional aCCessories (ConTinued)
The Modus splitter allows for multiple SR55 soft starters to be connected to a Modbus RTU
network over RS-485. The splitter allows for the interconnections to be made with standard
RJ45 Ethernet patch cables from splitter to splitter. The splitter can then be connected to
the starter’s RJ12 port with a standard Ethernet patch cable and an SR55-RJ45-RJ12 adapter
(included). The maximum length the network can be is 4000 feet total and a maximum of 31
starters.
If the SR55-KPD-REM optional remote touchscreen is to be the master, then set each starter to
a unique Modbus address (1-31). If another device such as a PLC is to be the master, then set
each starter to a unique Modbus address (2-31).
All three RJ45 ports on the SR55-SPLT are not interchangeable as far as functionality. The
differences are described below along with the BAG terminating strip (located inside the
SR55-SPLT).
•
The RJ45 port on the right must go to the Modbus master (remote touchscreen or PLC). This
is only for the first splitter on the network. For all other splitters on the network this port will
be the connection point from the previous splitter.
•
The middle RJ45 port connects to the starter using a standard RJ45 Ethernet patch cord and
an SR55-RJ45-RJ12 adapter.
•
The RJ45 port on the left connects to the next splitter on the network. If this is the last
splitter on the network then leave this port unconnected.
•
The three terminals B, A, and G inside the splitter are for wiring to a third party Modbus RTU
slave device. These terminals are simply TDX00-A and TDX01-B signal lines + Ground. Use
BAG term strip or the middle RJ45 connector; do not use both.
Inside the splitter there are multiple jumpers that need to be configured before the splitter will
function properly. Access these jumpers by removing the front cover, which is attached with
four screws.
•
Jumper S6
For the first splitter on the network, jumper S6 inside the box must be connected if using the
SR55-KPD-REM. Jumper S6 provides 24VDC to the touchscreen for power. Do not connect
jumper S6 if using a different master as this could damage the master. Do not connect S6 for
all other splitters on the network, only the first one.
•
Jumper S9
Connect jumper S9 on the last splitter on the network. This puts in a 120 Ohm terminating
resistor.
•
No other jumper needs to be configured and should not be reconfigured. For reference, the
default settings for the remaining jumpers are:
S1 = open
S2 = open
S3 = closed
S4 = closed
S5 = closed
S7 = closed
S8 = open
S10 = open
S11 = closed
All three RJ45 ports have the same pin layout. (Pins 1, 2, 3, and 6 are not used.)
•
Pin 4: TXD1-A
•
Pin 5: TXD0B
•
Pin 7: 24VDC (when jumper S6 is connected)
•
Pin 8: GND
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