VPort 2141 Video Encoder User’s Manual
Introduction
1-7
No. Pin
description
Regulation
1 -
2
Power Output
+
Power Output, Max. 500 mA at 12 VDC
3
NO
Normal Open, Max. 1A, 24 VDC or 0.5A, 125 VAC
4
C
Common, Short with NC at initial state
5
Relay Output 1
NC
Normal Close, Max. 1A, 24 VDC or 0.5A, 125 VAC
6
NO
Normal Open, Max. 1A, 24 VDC or 0.5A, 125 VAC
7
C
Common, Short with NC at initial state
8
Relay Output 2
NC
Normal Close, Max. 1A, 24 VDC or 0.5A, 125 VAC
9
+
Max. 50 mA, 12 VDC
10
Digital Input 1
- Ground
11
+
Max. 50 mA, 12 VDC
12
Digital Input 2
- Ground
13
RS-485
+
RS-485, Data +
14 +
15
Power Input
-
External Power Input, Min. 1.5A, 12-15 VAC or VDC
16
NO
Normal Open, Max. 1A, 24 VDC or 0.5A, 125 VAC
17
C
Common, Short with NC at initial state
18
Relay Output 3
NC
Normal Close, Max. 1A, 24 VDC or 0.5A, 125 VAC
19
NO
Normal Open, Max. 1A, 24 VDC or 0.5A, 125 VAC
20
C
Common, Short with NC at initial state
21
Relay Output 4
NC
Normal Close, Max. 1A, 24 VDC or 0.5A, 125 VAC
22
+
Max. 50 mA, 12 VDC
23
Digital Input 3
- Ground
24
+
Max. 50 mA, 12 VDC
25
Digital Input 4
- Ground
26
RS-485
-
RS-485, Data -
a.
Power Source: There are 2 ways to connect to the power source. You may use a power
adaptor, or connect through pins 14 and 15 of the terminal block. This power source can
be either AC or DC, and the output range should fall between 12V and 15V. Polarity does
not matter if you use AC. The power output through pins 1 and 2 is fed from the power
adaptor of the video encoder, or pins 14 and 15 if an external power source is attached.
The current from external devices is limited to less than 500 mA.
b.
RS-485
:
If the device has an RS-485 interface (such as a PTZ camera control), wire the
RS-485 Data+ (PIN 13) and Data- (PIN 26) control lines to the RS-485 “+” and “ –” pins.
If the distance from the controlled device is too long to allow transmit signals accurately,
an external power source may be used to pull the RS-485 signal to the “high” status.
c.
Digital Input/Relay Output: The VPort 2141 video encoder provides 4 digital inputs and 4
relay outputs. The digital input’s “+” pin and “-” pin can be connected to an external
sensor to monitor the voltage. The relay output’s “NO” pin (Normal Open), “NC”
(Normal Close) pin, and “C” pin (Common) can be used to turn an external alarm on or
off. When the system starts up, the “Common” pins of the two relay outputs will short the
“NC” pin. A simple example is illustrated in the diagram below.
