ARTHUR HOLM ERT 30, Руководство пользователя

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CONTROLS AND CONNECTORS
Ethernet: RJ45 network connector. Connect the ERT to the local
network to open the 2002 port and send AHnet commands to the units
connected to the RS422 ports (AHnet1 and AHnet2).
Service: USB connector used only for firmware upgrades.
AHnet1: RJ45 RS422 port. To control the units using AHnet commands,
connect the Arthur Holm or the Albiral units on this connector.
AHnet2:
RJ45 RS422 port. To control the units using AHnet commands,
connect the Arthur Holm or the Albiral units on this connector.
Note: The ERT-30 has one AHnet RS422 port connector, only. With one
ERT-30, the user is able to control up to 30 devices, and with one ERT-60,
the user is able control up to 60 devices by using the two AHnet port
connectors (30 devices connected on each port).