Serial Communication - NEX ROBOTICS FIREBIRD V ATMEGA 2560 Hardware Manual

3.16 Serial Communication

Robot has 9pin female DB9 connector for serial communication. Out of these 9 pins only Tx (pin
3) Rx (pin 2) and ground (pin 5) are connected to the microcontroller via MAX202 RS232 to
serial TTL / CMOS logic converter. Figure 3.53 shows location of the serial on main board.
Figure 3.54 shows schematic. Table 3.19 shows the connections of the serial port.
Figure 3.54: Serial port connections with the main board socket
Pin No.
2
3
5
© NEX Robotics Pvt. Ltd. and ERTS Lab, CSE, IIT Bombay, INDIA
Figure 3.53: Serial port pins
Description
Receiver Data (RXD)
Transmit Data (TXD)
Signal Ground (GND)
Table 3.19: Serial port pin out
Fire Bird V ATMEGA2560 Hardware Manual
Main Board pin numbers
Pin 74
Pin 75
Ground
63