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Concept

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Products: AS-P
Functionalities: Hardware
Product version: 2022, 2023, 2024, 7.0
12/17/2021

AS-P Server Screw Terminals

There are pluggable screw terminals at the top of an AS-P server.

The AS-P server comes in different models. The AS-P and AS-P-S models have three screw terminal blocks (with 4, 3, and 5 poles) whereas the AS-P-NL and AS-P-NLS models have two screw terminal blocks (with 4 and 3 poles).

Recommended screw tightening torque: 0.56 Nm (5 lbf.in)

AS-P and AS-P-S models
 
action_zoom_plus_stroke AS-P and AS-P-S models, screw terminals and other connectors
Figure: AS-P and AS-P-S models, screw terminals and other connectors

Table: Top Side Screw Terminals, AS-P and AS-P-S Models

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 the AS-P server and are easily inserted/removed without disrupting the network. Doing so may help in isolating possible RS-485 communication problems.

AS-P-NL and AS-P-NLS models
 
action_zoom_plus_stroke AS-P-NL and AS-P-NLS models, screw terminals and other connectors
Figure: AS-P-NL and AS-P-NLS models, screw terminals and other connectors

Table: Top Side Screw Terminals, AS-P-NL and AS-P-NLS Models

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

Other

8

NC

Not connected

9

NC

Not connected

10

RET

Internally connected to ground

11

NC

Not connected

12

NC

Not connected

The screw terminals 1 to 7, intended for RS-485 communication, act as connectors to the AS-P server and are easily inserted/removed without disrupting the network. Doing so may help in isolating possible RS-485 communication problems.

See Also

  • Hardware Overview
  • AS-P Servers