Motherboard digital input port: the instrument main board provides 3 programmable input port. receives the passive contact switch signal.
主板数字输入端口．仪表主板提供3个可编程输入端口，接收无源触点开关信号。
Matching fitted pressure switch has access to the main control board when this function effectively.
选配装接有水压开关至主控板时此功能有效。
Matching fitted pressure switch has access to the main control board when this function effectively.
选配装接有水压开关至主控板时此功能有效。
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