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+--- Thread: RS485 - BIAS and TERMINATING resistors (/showthread.php?tid=6414)
RS485 - BIAS and TERMINATING resistors - thom4s - 08-15-2024
Hello,
Iv got a RS485 network with Master (USB to RS485 + NodeRed) and some another nodes (up to 100m distance).
I want add to the "middle" of network 2x KC868 A16 with ESPhome FW.
USBtoRS485(master) ==== KC868-A16(slave) ==== KC868-A16(slave) ==== Last node(slave).
Master has BIAS resistors + 120 R resistor. Last node only 120 R terminating resistor.
Am I right when I think that BIAS and TERMINATING resistors has to be desoldered from both KC868-A16 ?
By schematics BIAS are R77, R81 (4k7) and terminating resistor R79 (120R).
Thank you.
RE: RS485 - BIAS and TERMINATING resistors - admin - 08-16-2024
if you want KC868-A16 work as "SLAVE", you need remove the 120R ohm resistor R79 from PCB.