Alarm detector ground terminal (GND) and com-side parallel (alarm detectors by
external power supply);
Ground terminal and the ground terminal DVR alarm detector and then;
NC end alarm detector is connected to DVR alarm input terminal (ALARM);
When using an external power supply required for alarm equipment and DVR common
ground.
2.7.7
Alarm Output Port Description
2 channels alarm output (normally open contact), the need for external alarm device
power supply;
To avoid overload and damage the host, please refer to the relay relevant parameters
when connecting relay relevant parameters Annex.
2.7.8
Alarm output Relay terminal parameters
Model: JRC-27F
Shock material
Silver
Ratings
(Resistive load)
Rated switching capacity
30VDC 2A, 125VAC 1A
Maximum switching power
125VA 160W
Maximum switching voltage
250VAC, 220VDC
Maximum switching current
1A
Insulation
between the same polarity Contacts
1000VAC 1 minute
between different polarity Contacts
1000VAC 1 minute
Between coil and contacts
1000VAC 1 minute
Surge voltage
between the same polarity Contacts
1500VAC (10×160us)
Opening time
3ms max
Turn-off time
3ms max
Lifetime
Machinery
50×106 MIN
（
3Hz)
Electrical
200×103 MIN (0.5Hz)
Work environment
温度
-40~+70
℃
2.8
Connect Line 485
8 external alarm 485 Schematic