# PG40-AC RS232 4G LTE Serial Device Server (AC Power)

> AC-powered RS232 4G LTE serial device server for remote monitoring of industrial serial equipment.

- **URL**: https://www.iiotsys.net/products/pg40-ac-rs232-4g-lte-serial-device-server-ac-power
- **Markdown**: https://www.iiotsys.net/products/pg40-ac-rs232-4g-lte-serial-device-server-ac-power.md
- **Model**: PG40-AC
- **SKU**: IIS-SG-PG40-AC
- **Price**: $29.00 USD
- **Category**: Industrial Gateways & Serial Servers

## Overview

The IIoTSys PG40-AC connects one RS232 serial interface to a cellular network through a LTE Cat.1 module. It is intended for remote monitoring of industrial serial equipment, sensors, controllers, and data acquisition systems. This AC-powered model accepts 100–240 VAC, 50–60 Hz. A Cortex-M3 processor runs at 96 MHz with the FreeRTOS operating system.

The 4G band option combines LTE-FDD and LTE-TDD bands in one selection: B1 / B3 / B5 / B8 / B34 / B38 / B39 / B40 / B41. Check the bands against the intended mobile operator before deployment. The device uses a Nano SIM card with 1.8 V or 3 V support and has an SMA cellular antenna connector. The band selection identifies the supported 4G radio bands, rather than a guaranteed connection on every network.

Network working modes include transparent transmission, HTTP, MQTT, and WebSocket. The device supports a maximum of 3 TCP or UDP connections, with a 1400-byte data cache for each connection. Modbus TCP to Modbus RTU conversion connects a network-side Modbus application with serial equipment. NTP support provides a network time function. These functions cover serial networking and protocol integration without requiring a change to the equipment's serial interface.

Serial framing includes 7 or 8 data bits, 1 or 2 stop bits, and None, Even, or Odd parity. Software flow control is specified. Connect RX to the equipment TX, TX to the equipment RX, and GND to GND. The shared GND connection is required. 

Configuration is available through serial AT commands, SMS AT commands, and companion configuration software over the serial or network connection. Registration packets and heartbeat packets can combine ICCID, IMEI, IMSI, software version, and cellular connection status. Firmware updates are available through the serial port and network OTA. These functions support setup and maintenance of deployed serial devices.

The enclosure measures 102.03 × 64.95 × 27.50 mm and mounts on a C45 guide rail. Operating temperature is −40 to +70 °C. Storage conditions are −40 to +85 °C and 5–95% RH without condensation. Net, Active, Power, and Link indicators show network, serial activity, power, and server connection status. Reload restores factory settings, while Reset performs a hardware reset.

## Description

RS232-to-4G LTE serial device server with a LTE Cat.1 module and 100–240 VAC, 50–60 Hz input. Supports transparent transmission, HTTP, MQTT, WebSocket, and Modbus TCP to Modbus RTU conversion.

## Specifications

- Model: PG40-AC
- SKU: IIS-SG-PG40-AC
- Product type: RS232-to-4G LTE serial device server
- Cellular module: LTE Cat.1
- 4G bands: B1 / B3 / B5 / B8 / B34 / B38 / B39 / B40 / B41
- Processor: Cortex-M3, 96 MHz
- Operating system: FreeRTOS
- Serial interface: 1 × RS232
- Serial wiring: Connect RX to the equipment TX, TX to the equipment RX, and GND to GND. The shared GND connection is required.
- Baud rate: TTL: 1200–460800 bps
- Data bits: 7 / 8
- Stop bits: 1 / 2
- Parity: None / Even / Odd
- Flow control: Software flow control
- Working modes: Network transparent transmission / HTTP / MQTT / WebSocket
- TCP/UDP connections: Maximum 3 connections; 1400-byte data cache per connection
- Modbus conversion: Modbus TCP to Modbus RTU
- Time synchronization: NTP
- SIM card: Nano SIM, 1.8 V / 3 V
- Antenna connector: SMA cellular antenna connector
- Configuration: Serial AT commands; SMS AT commands; companion serial or network configuration software
- Registration and heartbeat packets: Can combine ICCID, IMEI, IMSI, software version, and cellular connection status
- Firmware update: Serial port and network OTA
- Power input: 100–240 VAC, 50–60 Hz
- Average working current: Approximately 80 mA at 12 VDC; not an AC mains-current rating
- Peak current: 2 A; test conditions are not specified
- Dimensions: 102.03 × 64.95 × 27.50 mm (L × W × H)
- Mounting: C45 guide rail
- Operating temperature: −40 to +70 °C
- Storage conditions: −40 to +85 °C; 5–95% RH, non-condensing
- Indicators: Net / Active / Power / Link
- Factory reset: After power-up, hold Reload for more than 3 seconds and release
- Hardware reset: Reset button
- EMC: Class B, as stated in the manual; no certification claim

## Protocols

- 4G LTE (native): China LTE Cat.1; B1 / B3 / B5 / B8 / B34 / B38 / B39 / B40 / B41
- RS232 (native): One serial interface. Connect RX to the equipment TX, TX to the equipment RX, and GND to GND. The shared GND connection is required.
- TCP (native): TCP connections for serial networking
- UDP (native): UDP connections for serial networking
- HTTP (native): HTTP working mode
- MQTT (native): MQTT working mode
- WebSocket (native): WebSocket working mode
- NTP (native): Network time support
- Modbus TCP to Modbus RTU (convert): Converts Modbus TCP to Modbus RTU.

## Features

- One RS232 interface; 100–240 VAC, 50–60 Hz input
- China LTE Cat.1 with one combined LTE-FDD and LTE-TDD band option
- Cortex-M3 processor at 96 MHz; FreeRTOS
- Transparent transmission, HTTP, MQTT, and WebSocket working modes
- Maximum 3 TCP/UDP connections with a 1400-byte cache for each connection
- Modbus TCP to Modbus RTU conversion; NTP
- Nano SIM supporting 1.8 V and 3 V; SMA cellular antenna connector
- Serial AT, SMS AT, and companion software configuration
- Registration and heartbeat packets with device and connection information
- Serial and network OTA firmware updates
- 7/8 data bits; 1/2 stop bits; None/Even/Odd parity; software flow control
- C45 guide-rail mounting; −40 to +70 °C operation

## Use cases

- Remote monitoring of serial equipment
- Industrial sensor and controller networking
- Production asset tracking and monitoring
- Data acquisition equipment connectivity
- UPS power management equipment networking

## FAQ

### Which serial interface does the PG40-AC provide?
It has one RS232 interface. PG40 is the RS232 version and PG41 is the RS485 version. Connect RX to the equipment TX, TX to the equipment RX, and GND to GND. The shared GND connection is required.
### Which power supply does this model require?
The PG40-AC accepts 100–240 VAC, 50–60 Hz. Use the AC L and N input terminals.
### Which 4G bands are included in the option?
The LTE Cat.1 option includes B1 / B3 / B5 / B8 / B34 / B38 / B39 / B40 / B41. LTE-FDD and LTE-TDD bands are combined in one selection. Check compatibility with the intended operator before deployment.
### What SIM card does it use?
It uses a Nano SIM card and supports 1.8 V and 3 V SIM operation.
### Does it support Modbus and other network modes?
It supports Modbus TCP to Modbus RTU conversion. Working modes include network transparent transmission, HTTP, MQTT, and WebSocket. A maximum of 3 TCP/UDP connections is supported, each with a 1400-byte cache.
### How is it mounted, and what are its environmental limits?
The 102.03 × 64.95 × 27.50 mm enclosure mounts on a C45 guide rail. Operating temperature is −40 to +70 °C. Storage conditions are −40 to +85 °C and 5–95% RH without condensation.
### Which serial framing and baud settings are documented?
Serial framing supports 7 or 8 data bits, 1 or 2 stop bits, and None, Even, or Odd parity. Software flow control is specified. The baud range is labeled TTL: 1200–460800 bps.
### How is the device configured and updated?
Use serial AT commands, SMS AT commands, or companion configuration software over the serial or network connection. Firmware updates are available through the serial port and network OTA. After power-up, hold Reload for more than 3 seconds and release to restore factory settings. Reset performs a hardware reset.

## Related

- [4G LTE](https://www.iiotsys.net/technologies/4g-lte)
- [RS-485/RS-232](https://www.iiotsys.net/technologies/rs-485rs-232)
- [Modbus RTU/TCP](https://www.iiotsys.net/technologies/modbus-rtutcp)
- [MQTT](https://www.iiotsys.net/technologies/mqtt)
- [DIN Rail Mount](https://www.iiotsys.net/technologies/din-rail-mount)