34003602EN/AB
- Page 19
2. Installation
Impedance matching and bias settings
If a specific adjustment is required on the RS485 link, see the settings on DIP switch SA1:
Switch number
1
2
3
4
Function
T+
to
R+
connection
T-
to
R-
connection
T+
0V bias
R+ R-
impedance matching
Switch number
5
6
7
8
Function
R+
0V bias
T-
+5V bias
T+ T-
impedance matching
R-
+5V bias
Default position
◗
Master (fixed)
◗
Two-wire link
◗
Bias
◗
Without impedance
matching
Example:
SA1.6 = ON, T- has a +5V bias,
SA1.6 = OFF, T- does not have a +5V bias.
Settings
JBUS / RS485
PowerServices TelPac
UPS
CD
Phone
A 5V B R+ R- T+ T-
SA1
OFF
ON
1
8
All manuals and user guides at all-guides.com
