RS232 to TTL Converter 5V IO Signal with PSU

Professional module for projects requiring RS232/PC interface to robotics and microcontroller based projects. This module converts signals between RS232 voltage levels and TTL voltage levels and has a built-in PSU regulator for also supplying power  to external circuits like a hard drive or other device.


** Made in UK.** 
Manufactured and tested in the UK by Tronisoft Limited.

RoHS compliant - professional 2-layer, nickel/immersion gold (PCB).

Features:

• High speed, replaceable MAX232 based. Device fitted supports upto 120kbps.
• Works with PCs or Laptops.
• Tested with microcontroller UARTs e.g. Microchip PIC16F877 and Atmel AVR (ATMEGA8515) devices.
• +5V signal levels at the TTL level.
• Triple ultra low current LEDs for indication of POWER and TX, RX lines.
• On board PSU for internal use and external for powering your projects!
• Suitable for interface to Microchip PIC, Atmel AVR and other such micros.
• PP3 Battery connector for quick start out of the box.
• Power can be routed to pin 9 (if required) on RS232 connector for controlling e.g. Bluetooth and barcode devices.

PP3 battery/PSU connector:

Red wire - input +6 to +9V. Higher voltages may be used but may require a heatsink on the 7805 regulator IC.
Black wire - GND (ground).

TTL Connections (5V):

Pin 1: GND - this pin is the ground pin. This pin is usually connected to the 0V rail of the application hardware.

Pin 2: VCC(+) - this pin supplies regulated 5V from the on-board PSU and may be used to provide power to related circuits such as a PIC micro. This pin is not normally connected but if used to power external circuit do not exceed the capabilities of 7805 regulator IC. Can draw upto 150mA without any problems but may need heatsink to draw say 400mA depending on input voltage applied at PP3 connector.

Pin 3: RX (input - from UART into PC) - this pin is usually connected to the TX output pin of the UART in the microcontroller. This is an input pin.

Pin 4: TX (output - from PC to UART) - this pin is usually connected to the RX pin of the UART in the microcontroller. This is an output pin and will be data from the RS232/PC side of the converter.

Pin 5: CTS (input - from UART into PC) - this pin is part of the RS232 "Hardware Flow Control" system. Normally this signal is used by the UART to flag to the PC when the UART is ready to receive data. However, because of the various interpretations of the RS232 "standard", the exact way this signal may be used will change from system to system.

Pin 6: RTS (output - from the PC to the UART) - this pin is part of the RS232 "Hardware Flow Control" system. Normally this signal is used by the PC to flag when the microcontroller can send data. However, because of the various interpretations of the RS232 "standard", the exact way this signal may be used will change from system to system.

Fully assembled and tested.

Contact us if you would like alternative build versions.
Free software and terminal program
Free software and terminal program


Related information:
RS232 To TTL Converter User Guide
ASCII Serial Port Crib Sheets
MAX232 - RS232 TTL IC Data sheet