RS232 Isolator click

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  • MIKROE-2864
  • MIKROE-2864
RS232 Isolator click  is a fully isolated dual transceiver click, used to provide secure... more
Product information "RS232 Isolator click"

RS232 Isolator click is a fully isolated dual transceiver click, used to provide secure and easy UART to RS232 conversion, with the galvanic isolation. The digital input and output signals are transmitted across the isolation barrier by utilizing the Analog Devices proprietary iCoupler® technology - IC scale transformer windings couple the digital signals magnetically, from one side of the barrier to the other, providing the galvanic isolation and transfer rates up to 460Kbps.

RS232 Isolator click can be used for galvanic isolation of RS232 signals, whenever there is a need for that kind of isolation - operating in harsh environments where electrostatic discharges (ESD) can occur, when the RS232 cable is plugged in and out frequently, and generally - wherever the sensitive part of the RS232 controller logic circuitry needs to be protected.

How does it work?

The RS232 is a serial communication standard, which was first introduced in ’60s. It became very popular during ’90s, as it became an integral part of many PC motherboards. After several reviews of this standard and thanks to its simplicity and past ubiquity, RS232 is still being used - particularly in industrial machines, networking equipment, and scientific instruments where a short-range, point-to-point, low-speed wired data connection is required.

The logic voltage levels used by the RS232 can go up to ±15V with respect to the common ground. This is very different than the CMOS/TTL voltage levels used on many MCUs and other types of commonly used modern devices, so the first task of the RS232 isolator board is to provide appropriate RS232/TTL levels.

The main active component of the RS232 Isolator click is the ADM3252E, an integrated dual channel RS232 driver/receiver, with the iCoupler® isolation technology, made by Analog Devices. This integrated circuit features four integrated galvanic isolation elements that provide the required isolation level. RS232 level inputs are inverted and encoded into waveforms that are used to energize the primary windings of the integrated transformers. At the secondary windings, the induced waveforms are decoded back into the digital values and routed to the pins, with the appropriate TTL/CMOS voltage levels. The same working principle is applied in the opposite direction, too. This way, the digital signals are effectively conducted through the isolation barrier.

Besides the UART RX and TX lines, the click also supports the hardware flow control via the CTS and RTS lines. One of the two existing channels is used for the UART data communication itself, while the other channel is used for the hardware flow control lines. The usage of the control lines is not always mandatory, so the lines can be disconnected from the mikroBUS if needed, by unsoldering the SMD jumpers labeled as J1 and J2.

The ADM3252E IC also features the isoPower™ technology - an integrated DC-DC converter for generating all the required voltage levels, making it possible to power the click board™ by 3.3V or 5V. The operating voltage for the click board™ can be set with the onboard SMD jumper.

RS232 Isolator click features the onboard D-Sub 9 (DE9) connector for an easy and secure connection.


Type RS232
Applications For applications which operate in harsh, industrial environments, when the RS23 cable is plugged in and out frequently. It can be used whenever the sensitive control circuitry needs to be isolated from the RS232 line levels.
On-board modules ADM3252E, an isolated, dual channel, RS-232 line driver/receiver from Analog Devices
Key Features High voltage galvanic isolation of RS232 lines, high speed communication, up to 460 Kbps, D-Sub connector for easy connection
Interface GPIO,UART
Input Voltage 3.3V or 5V
Click board size L (57.15 x 25.4 mm)

Pinout diagram

This table shows how the pinout on RS232 Isolator click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes Pin Mikrobus logo.png Pin Notes
  NC 1 AN PWM 16 NC  
  NC 2 RST INT 15 RTS Request to Send
Clear to Send CTS 3 CS RX 14 TXD Transmit Data
  NC 4 SCK TX 13 RXD Receive Data
  NC 5 MISO SCL 12 NC  
  NC 6 MOSI SDA 11 NC  
Power Supply +3.3V 7 3.3V 5V 10 +5V Power Supply
Ground GND 8 GND GND 9 GND Ground

RS232 Isolator click electrical specifications

Description Min Typ Max Unit
Receiver inputs voltage range -30   +30 V

Onboard settings and indicators

Label Name Default Description
LD1 PWR - Power LED indicator
J1 VCC SEL Left Power supply voltage selection: left position 3V3, right position 5V
J2 J2 Soldered CTS connection to mikroBUS™ 
J3 J3 Soldered RTS connection to mikroBUS™
CN1 RS232 - RS232 connector

Software support

We provide an example for RS232 Isolator click inside all of our compilers. You can navigate to the demo using Project Explorer placed inside the folder named same as your development system.

Examples Description

Example application acts as a simple echo and each character is sent using the available terminal in all MikroElektronika compilers. Also, any other terminal of your choice can be used to write and read the messages.

char uard_rd;
void main()
UART1_Init(9600);               // Initialize UART module at 9600 bps
Delay_ms(100);                  // Wait for UART module to stabilize
while (1)
if (UART1_Data_Ready())
uart_rd = UART1_Read();     // read the received data,
UART1_Write(uart_rd);       // and send data via UART


 mikroBUS™ Standard specification 

 ADM3252E datasheet

 RS232 Isolator click schematic

 RS232 Isolator click - 2D and 3D files

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