Концепт
AS-P-3 Screw Terminals
The AS-P-3 model has four removable screw terminal blocks, one for the power input and three for RS-485 serial communications.
Recommended screw tightening torque: 0.56 Nm (5 lbf.in)
The removable screw terminal blocks are used as follows:
One 3-position terminal block for the power input
One 4-position terminal block for the RS-485 Com A port
One 3-position terminal block for the RS-485 Com B port
One 3-position terminal block for the RS-485 Com C port
The RS-485 Com C port cannot currently be configured for BACnet MS/TP communication.
|
Terminal number |
Designation |
Usage |
|
Power input |
|
|
|
1 |
L/+ |
Line (L) lead when operating the device from 24 VAC 
Positive (+) lead when operating the device from 24-30 VDC 
|
|
2 |
N/– |
Neutral (N) lead when operating the device from 24 VAC
Negative (–) lead when operating the device from 24-30 VDC
|
|
3 |
|
Functional earth ground |
|
RS-485 Com A |
|
|
|
4 |
TX/RX + |
RS-485 communication |
|
5 |
TX/RX – |
RS-485 communication |
|
6 |
RET |
Internally connected to terminal 3 (functional earth ground) |
|
7 |
Bias + |
5.0 VDC, RS-485 bias supply, current limited 40 mA |
|
RS-485 Com B |
|
|
|
8 |
TX/RX + |
RS-485 communication |
|
9 |
TX/RX – |
RS-485 communication |
|
10 |
RET |
Internally connected to terminal 3 (functional earth ground) |
|
RS-485 Com C a |
|
|
|
11 |
TX/RX + |
RS-485 communication |
|
12 |
TX/RX – |
RS-485 communication |
|
13 |
RET |
Internally connected to terminal 3 (functional earth ground) |
- The RS-485 Com C port cannot currently be configured for BACnet MS/TP communication.
The screw terminals 4 to 13, intended for RS-485 communication, act as connectors to the automation server and are easily inserted/removed without disrupting the network. Doing so may help in isolating possible RS-485 communication problems.
AS-P-3 Servers
AS-P-3 Server Screw Terminals
Wiring
RS-485 Communications