IoT Base CatM DualMode CatM & NBIoT Communication Base

The IoT Base CatM is a functional IoT communication base designed for data transmission scenarios requiring lowlatency, lowthroughput, and longterm operation. Powered by the SIM7080G communication module, it supports CatM & NBIoT dual modes, covering most global frequency bands to meet diverse regional requirements.

With UART AT command control, SMA external antenna, and MicroSIM card slot, the IoT Base CatM ensures reliable connectivity. It integrates rich expansion interfaces (I2C, UART, GPIO, RS485, battery power interface) and supports ModBus industrial protocols, making it ideal for remote control, monitoring, telemedicine, and cloud data applications.

Features

• SIM7080G communication module

• CatM & NBIoT dualmode support (global multiband)

• UART interface with AT command control

• MicroSIM card slot

• SMA external antenna interface

• Expansion interfaces: RS485, I2C, GPIO, UART, battery power

• Supports industrial protocols (ModBus)

• Certified globally: Softbank, Telec, Docomo, KDDI, RCM, CERED, GCF, FCC, PTCRB, AT&T, Verizon, TMobile, US Cellular, Deutsche Telekom, RoHS, REACH

Package Contents

• 1 IoT Base CatM

• 1 SMA Antenna

• 1 12 V DC Power Adapter (US standard)

• 1 VH3.962P Terminal

• 1 VH3.964P Terminal

• 1 DINmount rail base plate

• 2 M328 screws

• 1 M3 hex key

Applications

• Remote control & monitoring

• Cloud data applications

• Telemedicine & healthcare IoT

• Bike sharing systems

• Data acquisition & industrial IoT

Technical Specifications

Specification	Parameters
Communication Module	SIM7080G (UART 115200 8N1)
Supported CatM Bands	B1/B2/B3/B4/B5/B8/B12/B13/B14/B18/B19/B20/B25/B26/B27/B28/B66/B85
Supported CatNB Bands	B1/B2/B3/B4/B5/B8/B12/B13/B18/B19/B20/B25/B26/B28/B66/B71/B85
CatM Speed	UL: 1119 kbps / DL: 589 kbps
NBIoT Speed	UL: 150 kbps / DL: 136 kbps
RF Power Class	Class 5 (Typ. 21 dBm)
Protocols Supported	TCP, UDP, HTTP, HTTPS, TLS, DTLS, PING, LWM2M, COAP, MQTT, SSL
Operating Current	42 mA (DC 12 V input, connected)
Interfaces	I2C, GPIO, UART (HY2.04P), RS485 (VH3.964P), DC power, lithium battery
Product Size	80 54 33 mm
Product Weight	29.4 g
Package Size	104 99 60 mm
Gross Weight	153.6 g

Certifications

• SIM7080G_AT&T_Certificate_2020
• SIM7080G_GCF_Certificate_2020
• SIM7080G_NCC_2020
• SIM7080G_PTCRB_Certificate_2020
• SIM7080G_RCM_Compliance Certificate_2020
• SIM7080G_T-mobile_Certificate_2021
• SIM7080G_US Cellular_Certificate_2021

Schematics

PinMap

• SIM7080G

M5Core	G0	G35	G12	5V	GND
SIM7080G	RX	TX	PWR	VCC	GND

• RS485

CORE	G15	G13	5V	GND
RS485	TX	RX	VIN	GND

• HY2.0-4P

M5Core	G21	G22	5V	GND
I2C PORT	SDA	SCL	VCC	GND

M5Core	G36	G26	5V	GND
GPIO PORT	ADC	DAC	VCC	GND

M5Core	G17	G16	5V	GND
UART PORT	TX	RX	VCC	GND

M5-Bus

PIN	LEFT	RIGHT	PIN
GND	1	2	SIM7080G_TX
GND	3	4	PORT.B
GND	5	6	NC
NC	7	8	NC
NC	9	10	PORT.B
NC	11	12	NC
NC	13	14	NC
UART_RX	15	16	UART_TX
I2C_SDA	17	18	I2C_SCL
NC	19	20	NC
MOD PWR	21	22	RS485_TX
RS485_RX	23	24	SIM7080_RX
NC	25	26	NC
NC	27	28	5V
NC	29	30	BAT

Model Size

• IoT Base CatM Model Size PDF

Datasheets

• SIM7070_SIM7080_SIM7090 Series_CTBURST_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_CoAP(S)_Application Note_V1.03
• SIM7070_SIM7080_SIM7090 Series_Email_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_FOTA_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_FS_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_FTP(S)_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_GNSS_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_HTTP(S)_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_Linux_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_Low Power Mode_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_LwM2M_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_MQTT(S)_Application Note_V1.03
• SIM7070_SIM7080_SIM7090 Series_PING_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_SAT_Application Note_V1.02
• SIM7070_SIM7080_SIM7090 Series_SSL_Application Note_V1.00
• SIM7070_SIM7080_SIM7090 Series_TCPUDP(S)_Application Note_V1.03
• SIM7080_Series_SPEC_20200427

Softwares

Arduino

• IoT Base CatM MQTT Example
• IoT Base CatM Modbus Master Example
• IoT Base CatM Modbus Slave Example

UiFlow1

• IoT Base CatM UiFlow1 Docs

Protocol

• SIM7070_SIM7080_SIM7090 Series_AT Command Manual_V1.04