User's Manual l STK-MBa53 UM 100 l © 2013 TQ-Group
Page 32
Table 43:
Electrical parameters RS485
Parameter
Min.
Typ.
Max.
Unit
Remark
Transfer rate
–
–
tbd
baud
Line length
–
–
tbd
m
10 Mbaud
Line length
–
–
tbd
m
115,200 baud
Line length
–
–
tbd
m
96,000 baud
Output voltage Low
–
–
0.4
V
I
out
= +4 mA
Output voltage High
3.5
–
–
V
I
out
= –4 mA
The RS485 signals can be terminated with 120 Ω using DIP switches S4–1 and S4–2.
The possible settings of the DIP switches are shown in the following table.
Table 44:
Settings of DIP switch S4 for RS485
Switch
Interface
Position “On”
Position “Off”
S4–1
RS485
Receive path is terminated with 120 Ω
Receive path is not terminated
S4–2
RS485
Transmit path is terminated with 120 Ω
Transmit path is not terminated
Illustration 27: Position of pin headers S4
