device used to write ERI data directly or indirectly into an ERT by invoking ERI transactions

NOTE 1 In case an ERI writer exchanges the ERI protocol data units directly via a data link with an ERT it is also called an ERR. In case it communicates via one or more nodes, only the last node in this sequence is called an ERR. As a consequence, an external ERI writer may, e.g. depending on the onboard configuration, act for some vehicles as an ERR and for others not.

NOTE 2 See also onboard ERI writer and external ERI writer.