RS485 X9 cable requirements

Number of insulated conductor pairs and insulated conductor cross-section: at least 2 x 2 x 0.22 mm² (2 x 2 x 24 AWG)

Maximum cable length across the entire RS485 bus: < 1200 m (3937 ft)

Twisted pair conductors

Cable with shielding: Yes (on both sides on external shield connection terminal)