BQLZR 5V MAX485 RS-485 Module TTL to RS-485 Module for Raspberry Pi Pack of 5 On-board MAX485 chip is a low-power for RS-485 communications, Slew-Rate Transceiver. Onboard then 5.08 (mm) pitch 2P terminal, convenient RS-485 communication wiring. All pins of chip have been lead. This module can be controlled through the microcontroller. Dimension:44 x 19 x 12mm/1.73 x 0.75 x 0.47"(L x W x H)