for communications are active on the Modbus Plus port (Modbus Plus) 1 LED (green) for communications are active on the Modbus port (Modbus) 1 LED (green) for CPU has been started and is solving logic (RUN) 1 LED (green) for CPU has passed the power-up diagnostic tests (READY) 1 LED (green) for write-protected memory (memory port) 1 LED (orange) for battery needs replacing or is not present (BAT LOW) 1 LED (red) for communications error on the Modbus Plus port (ERROR A) 1 LED (red)
Electrical connection
1 female connector SUB-D 9 for connecting to the Modbus Plus network2 female connectors SUB-D 9 for connecting to the Modbus bus
