RKI Instruments M2 for 12 VDC User Manual
Page 35

M2 Transmitter Operator’s Manual, 12 VDC Operation
30
installed in an M2 that is at the end of a Modbus line. Any M2 in a Modbus system that is
not at the end of a line must have the termination jumper removed (see Figure 6 &
Figure 7 below).
Figure 6: Multiple M2s in a Daisy Chain Configuration
Figure 7: Multiple M2s in a Two Branch Configuration
Modbus
Master
M2
Termination
Jumper
Installed
M2
Termination
Jumper
Not Installed
M2
Termination
Jumper
Not Installed
M2
Termination
Jumper
Not Installed
M2
Termination
Jumper
Not Installed
ID = 128
ID = 127
ID = 126
ID = 125
ID = 1
Up to 128 M2s can be connected without a repeater.
RS-485
RS-485
Modbus
Master
M2
Termination
Jumper
Installed
M2
Termination
Jumper
Not Installed
M2
Termination
Jumper
Not Installed
M2
Termination
Jumper
Not Installed
M2
Termination
Jumper
Not Installed
ID = 1
ID = 2
ID = 3
ID = 4
M2
Termination
Jumper
Installed
ID = 128
ID = 127
Up to 128 M2s can be connected without a repeater.
RS-485
RS-485
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