4G Remote Wireless Smart Gateway

Working frequency band

LTE-FDD B1 B2 B3 B4 B5 B7 B8 B12 B13 B18 B19 B20 B25 B26 B28

LTE-TDD B38 B39 B40 B41

UMTS B1 B2 B4 B5 B6 B8 B19

GSM B2 B3 B5 B8 LORA 860~935MHz

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Product Detail

Products Operation



◆ It supports data acquisition of the serial port MODBUS RTU protocol and communicates with the Acrel server through the Acrel platform protocol.
◆ It supports for data acquisition of up to 30 MODBUS RTU devices.
◆ It supports the acquisition of 5 register address fields for each MODBUS device, with each register address range not exceeding 64.
◆ It supports triggering alarms by presetting alarm addresses and alarm values for each MODBUS address range. There are currently up to 14 alarm addresses for each address field.
◆ It supports server MODBUS or LORA unvarnished transmission communication.
◆ It supports to connect the data center by fixed IP and dynamic domain name resolution.











LORA 1371020MHz

RS485 communication


4G(MQTT protocol)

4G communication

Frequency band


LTE-TDD B34 B38 B39 B40 B41


GSM 900/1800M

LORA 1371020MHz



LTE-TDD B34 B38 B39 B40 B41


GSM 900/1800M

Transmission rate


LTE-FDD maximum download rate is 150Mbps, maximum upload rate is 50Mbps

LTE-TDD maximum download rate is 130Mbps, maximum upload rate is 35Mbps

CDMA maximum download rate is 3.1Mbps, maximum upload rate is 1.8Mbps

GSM maximum download rate is 107Kbps, maximum upload rate is 85.6Kbps

SIM card voltage


Antenna interface


Serial port type


Baud rate


Operating voltage


Operating current

350 ~ 400mA @ 12V (400mA when dialing)

Operating temperature


Storage temperature


Humidity range

0 ~ 95% non-condensing

Installation method

Base plate installation,35mm standard rail mounting(please specify when installing the guide rail)

Product size



Typical connection





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  • Operation

    ◆ Pulse constant:

    For antenna installation, the antenna interface of this device adopts 50Ω/SMA (female). The external antenna must use the antenna suitable for 4G working frequency band. If other mismatched antennas are used, it may affect or even damage the DTU.For SIM card installation, when installing the SIM card,make sure that the device is not powered. This device uses a drawer type SIM card holder.When opening, it needs to push the yellow button inward, then pull out the card holder. After installing the SIM card, push the card sleeve in.

    ◆ Panel light: 

    Status: two seconds of flashing indicates it is initializing the wireless module; One second of flashing indicates it is connecting the server; Normally on indicates it has been connected to the server. Signal: 1 second of flashing signal indicates the value is less than 50%; 0.5 second of flashing signal indicates the value is greater than 50%; Normally on signal indicates the value is greater than 80%. Communication: it flashes once when there is a pack of data interacting with the download device. Network: it flashes when there is network data transmission.

    ◆ The interface on one side of AF-GSM300/400 is shown in Figure 3:

    Power input, terminal mode: DC9 ~ 30V. RS485 signal input.


    ◆ The host computer is used for configuration:

    As shown in Figure 4, after the device is successfully connected to the host computer (the host status box turns green),the relevant status values and parameter values can be read ,or configure relevant parameters according to the needs. After writing the correct parameters, click on “Parameter Settings” to write and save the parameters to the device.


    ◆ Methods of Use:

    After setting the parameters, confirm that the download device in running normally and can be normally communicated with the gateway. Wait for establishing a connection with the server, and send the device number to the server to distinguish the device. In addition, the device will poll the download device to query the on-line download device according to the set query address range and query register address field, and report the rolled date to the server.

    Q: Are you trading company or manufacturer ?

    A: We are a manufacturer in Shanghai,China. Our factory is in Wuxi city, Jiangsu province.

    Q: How long is your delivery time?

    A: Generally it is 3-5 days if the goods are in stock. Or it is 10-15 days if the goods are not in stock, it is according to quantity.

    Q: Do you provide samples ?  is it free or extra ?

    A: Yes,we can provide the sample for low price. If you place the order ,all or part of the sample charge will be deducted from the goods.

    Q: How long can you send your quotation to us ?

    A: After got all the detailed information,we will quote within 1 working days.

    QWhat is your terms of payment ?

    A: Payment=1000USD,100% in advance. Payment 1000USD,30% Total contract amount in advance, balance before shipment.

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