Concetto
AS-P Screw Terminals
There are 4+3+5 pluggable screw terminals at the top of AS-P.
The following table describes the screw terminals at the top of AS-P.
|
Terminal number |
Designation |
Usage |
|
COM A |
|
|
|
1 |
TX/RX + |
RS-485 communication |
|
2 |
TX/RX – |
RS-485 communication |
|
3 |
RET |
Internally connected to ground |
|
4 |
Bias + |
5.0 VDC, 25 mA output for RS-485 biasing |
|
COM B |
|
|
|
5 |
TX/RX + |
RS-485 communication |
|
6 |
TX/RX – |
RS-485 communication |
|
7 |
RET |
Internally connected to ground |
|
LON |
|
|
|
8 |
TX/RX + |
RS-485 LonWorks |
|
9 |
TX/RX – |
RS-485 LonWorks |
|
10 |
RET |
Internally connected to ground |
|
11 |
LON-1 |
TP/FT-10 Free topology LonWorks network, 78 kbps |
|
12 |
LON-2 |
TP/FT-10 Free topology LonWorks network, 78 kbps |
The screw terminals 1 to 7, intended for RS-485 communication, act as connectors to AS-P and are easily inserted/removed without disrupting the network. Doing so may help in isolating possible RS-485 communication problems.
Hardware Overview
AS-Ps