R5
SUPREME - Navigation System
ELECTRICAL INTERFACES
7000 118-383, P11A1
Page 157
Electrical Characteristics of CDU Serial ports
The serial ports in the R5 SUPREME CDU are the Sensor Port, User Port 3 and user Port 4.
19.1.3.1 Output Drive Capacity
Each serial port transmitter in the R5 SUPREME CDU can have a maximum of 25 listeners
drawing 2.0 mA each.
19.1.3.2 Input Load
Input impedance for each listener input is 6.4 kΩ.
19.1.3.3 Termination
The R5 NAV Junction Box has built in termination resistors. If needed, the termination
resistors can be connected by flipping the respective termination switch in the junction box.
If the junct
ion box is not used, a 1kΩ termination resistor can be used close to the receiver
end.
19.1.3.4 Schematics
Each of the RS422 serial interfaces on the R5 SUPREME CDU fulfils the requirements of
IEC 61162-2. All serial ports on the R5 SUPREME CDU support communication rates up to
115200 bps.
A detailed schematic of the serial ports in the R5 SUPREME CDU is shown in Figure 130.
Figure 130
– R5 SUPREME CDU Serial Port Schematics
