Blog / Tag
#rs485
4 posts filed under this tag, newest first.
PROFIBUS and PROFINET: how each is wired, and what breaks
Purple cable at 150 Ω against green Ethernet, powered termination against none, device addresses against device names — and the fault each design invites.
8 min read
Modbus RTU not responding: a diagnostic sequence
Timeouts, CRC errors and silent devices, worked from what you can observe. Two minutes with a multimeter settles the two commonest causes.
7 min read
Modbus RTU on energy meters: six things that break
Wiring, termination, byte order, register offsets, phantom registers and polling intervals — the real RS485 failure modes, and how to tell them apart.
7 min read
RS485 wiring for Modbus: topology, termination, shields
Daisy chain not star, 120 Ω at both ends only, one earth on the shield, and the third wire everybody omits — the physical layer that decides if polling works.
7 min read