Datakom DKM-411 - Page 23

DKM-411 User Manual Rev_01 Firmware V-1.0
K46D03-EN - 23 -
RS-485 BUS STRUCTURE
A maximum of 32 devices can be paralleled on a RS-485 bus. For more devices on one bus, repeaters
must be used.
A B A B A BA B
120R 120R
The bus must be terminated from both ends with 120 ohm resistor.
The cable shield should be grounded from one end only.
The device does not have any internal terminating
resistors. External 120 ohm resistor should be added
to both extremities of the bus line.