MAX485 TTL to RS485 Module

TTL to RS485 Module (supporting EIA-485 standard) is for long range, high data rate error prone differential communication. Digital communications networks implementing the EIA-485 standard can be used effectively over long distances and in electrically noisy environments. Multiple receivers may be connected to such a network in a linear, multi-drop configuration. These characteristics make such networks useful in industrial environments and similar applications.

Going from TTL to RS485 is made simple by this prototyping friendly module. On one side of the board are the TTL IOs, and on the other are the RS485. At the core is a MAX485 which is powered by 5V.

Specifications

• Features MAX485 chipset
• Working Voltage: 5V
• Allows up to 32 transceivers on the bus
• Data Rate : 2.5Mbps
• Current-limiting and thermal shutdown for driver overload protection
• 5.08mm (0.2″) pitch, 2-pin terminals for RS-485 easy communication and wiring
• 4-pin 2.54mm (0.1″) pitch headers for RS485 and power
• 4-pin 2.54mm (0.1″) pitch headers for DI,DE,RE,RD signals
• PCB Board Size: 44 x 14mm
• Fully assembled, ready for use

Applications

• Multi-drop wired communication System, requiring multiple nodes needing to talk to each other.
• Long distance error prone wired communication
• High data rate wired communication

MAX485 IC.
This IC will take RS232 signals and perform the voltage level conversions required to turn them into 485 signals.

Pin-out:

1. RO – Receiver out
2. RE – Receiver enable (enabled when this pin is LOW)
3. DE – Driver enable (enabled when this pin is HIGH)
4. DI – Driver in (the transmitter pin)
5. GND – Ground (0V)
6. A – Connect to pin A of the other 485 IC
7. B – Connect to pin B of the other 485 IC
8. Vcc – Power, in my case +5V

Technical Reference 

MAX485 Data Sheet : https://datasheets.maximintegrated.com/en/ds/MAX1487-MAX491.pdf