FOXBORO FBM240 P0917GZ通道隔離開關
這種情況可能是由錯誤的消息格式（如波特率或成幀）、兩個RS485雙絞線連接的極性顛倒或主機未發送當前編程的PQM地址造成的。如果PQM被有效消息定期尋址，RX1/2指示燈將點亮，TX1/2指示燈隨后點亮。?TX1:PQM點亮時通過COM1 RS485通信端口傳輸信息。?RX1：點亮時，PQM通過COM1 RS485通信端口接收信息。?TX2:PQM點亮時通過COM2 RS485通信端口傳輸信息。?RX2：當點亮時，PQM通過COM2 RS485通信端口接收信息。3.2.4繼電器輸出繼電器的狀態與這些指示器一起顯示。?報警：報警繼電器用于通用報警輸出。報警繼電器工作時，該指示燈點亮。當條件清除時，報警指示燈熄滅。如果報警繼電器已編程為鎖定，則只能通過按鍵或發出計算機重置命令來清除報警條件。
This condition can be caused by incorrect message formats (such as baud rate or framing), reversed polarity of the two RS485 twisted-pair connections, or the master not sending the currently programmed PQM address. If the PQM is being periodically addressed with a valid message, the RX1/2 indicator will turn on followed by the TX1/2 indicator. ? TX1: The PQM is transmitting information via the COM1 RS485 communications port when lit. ? RX1: The PQM is receiving information via the COM1 RS485 communications port when lit. ? TX2: The PQM is transmitting information via the COM2 RS485 communications port when lit. ? RX2: The PQM is receiving information via the COM2 RS485 communications port when lit. 3.2.4 Relays The status of the output relays is displayed with these indicators. ? ALARM: The ALARM relay is intended for general purpose alarm outputs. This indicator is on while the ALARM relay is operating. When the condition clears, the ALARM indicator turns off. If the alarm relay has been programmed as latched, the alarm condition can only be cleared by pressing the key or by issuing a computer reset command.
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