B&B Electronics ESP904 Owner's Manual page 37

RS-422 Connections RS-422 Connections
Figure 49. Loopback Connections for RS-422
The RS-485 Connections are half duplex, either Receive or Transmit, so
another half duplex device must be used to check operation.
Figure 50. RS-422 Connection with No Flow Control
Manual Documentation Number: ESP904-0504 Appendix B 63 64 Appendix B Manual Documentation Number: ESP904-0504
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