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Port

Port Name

ALARM_OUT

Alarm I/O

ALARM_IN

ALARM_GND

1.2

Connecting Alarm Input/output

Alarm input/output is available on select models.

Step 1

Connect alarm input device to the alarm input end of the I/O port, see Figure 1-2.

Device collects different states of alarm input port when the input signal is idling and being

grounded.

Device collects logic "1" when input signal is connecting to +3V to +5V or idling.



Device collects logic "0" when input signal is grounded.



Step 2

Connect alarm output device to the alarm output end of the I/O port. The alarm output is

open-drain output, which works in the following modes.

Mode A: Level application. Alarm outputs high and low level, and the alarm outlet is OD,



which requires external pull-up resistance (10K Ohm typical) to work. The maximum

external pull-up level is 12V, maximum port current is 300mA and the default output

signal is high level (external pull-up voltage). The default output signal switches to low

level when there is alarm output (As long as the operating current below 300mA, the

output low level voltage is lower than 0.8V).

Mode B: Switch application. Alarm output is used to drive external circuit, the



maximum voltage is 12V and the maximum current is 300mA. If the voltage is higher

than 12V, please use an additional electric relay.

Table 1-2 Alarm information

Function

Outputs alarm signal to alarm device.

Receives the switch signal of external alarm source.

Ground connection.

Figure 1-2

Alarm input

Figure 1-3

Mode A

Quick Start Guide