FOXBORO FBM240 P0917GZ通道隔离开关
这种情况可能是由错误的消息格式（如波特率或成帧）、两个RS485双绞线连接的极性颠倒或主机未发送当前编程的PQM地址造成的。如果PQM被有效消息定期寻址，RX1/2指示灯将点亮，TX1/2指示灯随后点亮。•TX1:PQM点亮时通过COM1 RS485通信端口传输信息。•RX1：点亮时，PQM通过COM1 RS485通信端口接收信息。•TX2:PQM点亮时通过COM2 RS485通信端口传输信息。•RX2：当点亮时，PQM通过COM2 RS485通信端口接收信息。3.2.4继电器输出继电器的状态与这些指示器一起显示。•报警：报警继电器用于通用报警输出。报警继电器工作时，该指示灯点亮。当条件清除时，报警指示灯熄灭。如果报警继电器已编程为锁定，则只能通过按键或发出计算机重置命令来清除报警条件。
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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