RS232 Interface Board

RS232 Board provides an interface between the TTL/CMOS logic levels commonly used on microcontrollers and the RS-232 bus.

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Description

Description:

RS232 Board provides an interface between the TTL/CMOS logic levels commonly used on microcontrollers and the RS-232 bus. This RS232 Board allows to communicate through the RS-232 interface via the standard UART bus pins: RX and TX. The RS-232 board utilizes the SP3220E. This device can achieve communication speed up to 120 kbps.

HOW DOES IT WORK?

The main component of the RS-232 board is the SP3220E, a 3.0V to 5.5V low power, true RS-232 transceiver. This IC has one receiver and one transmitter channels, and it is used to bridge the physical differences between the CMOS/TTL signal levels and RS-232 bus levels. While CMOS/TTL signal levels vary from 0V to 5V typically, RS-232 uses the signal levels that range from ±5V, up to ±15 V. Important, that this interface do not use the RTS (Ready To Send) and CTS (Clear To Send) signals.

SPECIFICATIONS

Type Bemenet
Applications Simple solution for adding RS232 connectivity to your device
Compatibility Z-POE-Base panel
Interface GPIO, UART
Board size 41×44 mm
Input voltage 3.3V – 5V

PINOUT DIAGRAM

Notes Pin Connector Pin Notes
OUTPUT 2 IO-2 1 IO IO 2 IO-1 OUTPUT 1
NC NC 3 NC SHDN 4 SHDN SHDN
NC NC 5 NC NC 6 NC NC
TX TX 7 TX RX 8 RX RX
GND GND 9 GND EN 10 EN ENABLE
ADC INPUT ADC ID 11 ADC ADDR 12 ADDRESS ADDRESS SW
Ground GND 13 GND GND 14 GND Ground
NC NC 15 NC 5V 16 5V 5V

ONBOARD SETTINGS AND INDICATORS

Label Name Default Description
LD1 RX – Receive LED indicator
LD2 TX – Transmit LED indicator
J1 J1 3.3V Switch the IC (SP3220E) input voltage (3.3V or 5V)
X1 X1 – RS-232 output (TX,RX,GND)

 

 

 

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