Table 1 EIA RS-485 specifications
From: Optimizing linear routing in the ToLHnet protocol to improve performance over long RS-485 buses
Parameter | Conditions | Min | Max |
|---|---|---|---|
Driver output voltage | Open circuit | ±1.5 V | ±6 V |
Driver output voltage | R L=54 Ω | ±1.5 V | ±6 V |
Driver output short-circuit current | Output at 12 V or −7 V | ±250 mA | |
Driver output rise time | R L=54 Ω, C L=50 pF | 30 % of bit width | |
Driver common-mode voltage compliance | R L=54 Ω | −1 | ±3 V |
Receiver sensitivity | −7 V<V cm<12 V | ±200 mV | |
Receiver common-mode voltage range | −7 V | −12 V | |
Receiver input resistance | 12 kΩ |