ZHCSID5E April 2018 – September 2019 ISO1410 , ISO1412 , ISO1430 , ISO1432 , ISO1450 , ISO1452
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
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The current supplied by the driver must supply into a load because the output of the driver depends on this current. Add transceivers to the bus to increase the total bus loading. The RS-485 standard specifies a hypothetical term of a unit load (UL) to estimate the maximum number of possible bus loads. The UL represents a load impedance of approximately 12 kΩ. Standard-compliant drivers must be able to drive 32 of these ULs.
The ISO14xx devices have 1/8 UL impedance transceiver and can connect up to 256 nodes to the bus.