InHand InDTU324, User Manual

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9
There are two terminal wire sequences depending on the product models: RS-232 and RS-485.
Table 3-1-2 Two terminal wire sequences of the InDTU324
Pin Signal Name Description
RS-232/RS-485 Pin Definition
1 GPO General GPIO port for indicating the online and offline states of the
DTU
2 RX1 B (–) DTU serial port 1 for receiving data (RS232–/RS485–)
3 TX1 A (+) DTU serial port 1 for sending data (RS232+/RS485+)
4 TX2 DTU serial port 2 for sending data
5 OFF
Power control: disabled at a high level (3.0–10 V) and enabled at a
low level (0–0.3 V) or in the suspended state
6 RX2 DTU COM port 2 for receiving data
7 GPI General GPIO port, reserved
8 GND DGND for COM port grounding
9 GND Negative pole of power input
10 V+ Positive pole of power input
3.2 LED Indicator
3.2.1 InDTU332
InDTU332 has 3 indicator lights: POWER (red), SIM (yellow), STATUS (green); POWER: the
equipment should be kept on after POWER on; SIM and STATUS lights: indicate the working STATUS
of DTU.
DTU STATUS POWER SIM STATUS
Power on On Off Off
Dialing..., no fault. On Off Off
Dialing..., fault. On Off On
Dialing is successful, and connecting the
center.
On On Off
Dialing is successful, but failed to connect
to the center.
On On On
Connected to the center. On Blinking slowly with the same frequency
When DTU is used as TCP Server, if any
client connection succeeds
On Blinking slowly with the same frequency