MAX485CSA RS485 To TTL Development Module

This development-grade RS-485 to TTL converter module measures 44 × 14 × 20 mm and operates at 5 V. At its core lies the MAX485CSA transceiver — a low-power, slew-rate-limited IC engineered for noise-immune, long-distance serial communication. It includes a 5.08 mm pitch screw terminal for secure RS-485 cabling and provides full access to all six functional pins (VCC, GND, RO, RE, DE, DI), supporting both manual and firmware-controlled bus direction management. The module implements true RS-485 half-duplex differential signalling, offering superior common-mode rejection and immunity to ground potential differences — essential for connecting devices across separate buildings or electrically isolated zones. Verified for stable operation over 1200 metres, it meets industrial communication requirements without requiring external biasing resistors or termination switches. Its compact size and clear silkscreen make it equally suited for classroom labs, field-deployed telemetry nodes, or OEM integration into control panels. All components are surface-mounted for mechanical durability, and the PCB layout follows best practices for signal integrity — including short trace lengths between the MAX485CSA and terminal block to minimise stub effects on high-speed edges.