19
Figure 8 Connection of RS485 terminals
4.5.2
Termination resistor
Figure 9 Termination resistor
According to the RS485 specification, the last device on the bus must be
terminated with a 120R terminating resistor. If the control panel is the last
element of the bus, install a jumper on both pins. There is a separate
termination resistor for each bus, which is located below the terminal
block of the respective bus.
Connection of transmitters using 4-20 mA
If it is required to connect transmitters to the control panel using 4-20 mA, it is necessary to use DEGA UDA AI8 expansion
modules. Up to 8 transmitters can be connected to each module. The maximum number of modules is 25 pcs.
