DTE Interface - brickpool/logo GitHub Wiki
DTE-Interface for connecting the LOGO! PC cable
Rev. Bb
December 2020
Compact RS232 to TTL Converter with Male DB9 and Grove Connector
The Mini RS232 Seriel TTL Converter from China is a compact UART to RS232 Converter Module for out connection the Arduino to the LOGO! PG Cable.
I have create my own version, because I was not sure if the standard RS232 DB9 connectors are supports RTS (which is bridged to power the electronics in the PC cable). The product is not compatible to the 5-wire RS232 standard.
Figure RS232 Converter connected to the Arduino
Specs.
- Convert TTL (Transistor-Transistor Logic) level signals to RS-232 interface
- D-SUB 9pin (RS232) MALE connector
- Supports 3V to 5.5V power supply (we must use 5V for our project)
- IC: MAX3232
- Pitch: 2.54mm
- RTS pin: connected to VCC
PIN Layout
| Grove Pin | Name | Signal | Color |
|---|---|---|---|
| 4 | GND | Ground | black |
| 3 | VCC | Voltage 5V | red |
| 2 | ↑ TX | Transmit Data | white |
| 1 | ↓ RX | Receive Data | yellow |
Note: 1) DB9 Pin 6 have to be bridged to VCC to power the electronics in the PC cable. The system connected with the LOGO! cable must be able to supply at least 5 mA current through this Pin of its RS232 interface.
Figure PIN Layout of the Mini RS232 Seriel TTL Converter Board
Figure PIN Layout incl. the Grove connector