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3.4.4 RS 485 bus termination
For the ENT-DC-30 is an active bus data fixing necessary. In every ENT-DC-30 there is the possibility for an
appropiate termination. For this the jumper J8 has to be put on position 2-3 and J9 put on position 1-2. The
ENT-DC-30 which are in the midth of the bus the termination has not to be done ( J8 in position 1-2 and J9 in
position 2-3 *)
* factory status
bus termination
open
A
B
A
B
J4
J4
J4
J4
a
a
a
a
b
b
b
b
RS232 / 20mA CL
GND
5V
GND
RS232 / 20mA CL
SK - 485
SK-485
1
2
3
1
2
J9
J8
1
2
3
1
2
J9
J8
1
J9
TDOCT-4038_ENG / 2015-01
open
A
B
J4
J4
a
a
b
b
RS232 / 20mA CL
5V
GND
5V
SK-485
3
:Termination
3
:NORMAL
1
J8
open
bus termination
A
B
A
J4
J4
J4
a
a
a
b
b
b
RS232 / 20mA CL
GND
5V
GND
SK -485
J3'
1 2 3 4
1
ON
SW 1
B
J4
a
b
RS232 / 20mA CL
5V
SK- 48
J4'
15
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