RS232 Isolator click
PID: MIKROE-2864
Weight: 35 g
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. his 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.
Specifications
Type
Applications
RS232
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.
ADM3252E, an isolated, dual channel, RS-232 line driver/receiver from Analog Devices
High voltage galvanic isolation of RS232 lines, high speed communication, up to 460
Kbps, D-Sub connector for easy connection
GPIO,UART
3.3V or 5V
L (57.15 x 25.4 mm)
On-board
modules
Key Features
Interface
Input Voltage
Click board
size
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
NC
NC
Clear to Send
CTS
NC
NC
NC
Power Supply
Ground
+3.3V
GND
Pin
1
2
3
4
5
6
7
8
AN
RST
CS
SCK
MISO
MOSI
3.3V
GND
PWM
INT
RX
TX
SCL
SDA
5V
GND
16
15
14
13
12
11
10
9
Pin
NC
RTS
TXD
RXD
NC
NC
+5V
GND
Power Supply
Ground
Request to Send
Transmit Data
Receive Data
Notes
RS232 Isolator click electrical specifications
Description
Min Typ Max Unit
+30
V
Receiver inputs voltage range -30
Onboard settings and indicators
Label Name
LD1
J1
J2
J3
PWR
VCC SEL
J2
J3
Default
-
Left
Power LED indicator
Power supply voltage selection: left position 3V3, right position 5V
Description
Soldered CTS connection to mikroBUS™
Soldered RTS connection to mikroBUS™
-
RS232 connector
CN1 RS232
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);
Delay_ms(100);
// Initialize UART module at 9600 bps
// Wait for UART module to stabilize
UART1_Write_Text("Start");
UART1_Write(13)
;
UART1_Write(10)
;
while
(1)
{
if
(UART1_Data_Ready())
{
uart_rd
=
UART1_Read();
// read the received
data,
UART1_Write(uart_rd);
// and send data
via UART
}
}
}
Downloads
mikroBUS™ Standard specification
ADM3252E datasheet
RS232 Isolator click schematic
RS232 Isolator click - 2D and 3D files
https://www.mikroe.com/rs232-isolator-click 1-15-18
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