RKI Instruments M2 for 12 VDC - 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