Receive/Transmit Flags

You can set the flow control flags for RS-422 communications mode for each COM port. Table 2 shows how to set up COM1and COM2.

Receive Flag

 

Transmit Flag

 

COM Function

 

 

 

 

 

CLR (0)

 

CLR (0)

 

Not Used (Default)

 

 

 

 

 

CLR (0)

 

SET (1)

 

Use for RS-422 Operation:

 

 

 

 

Full Duplex

 

 

 

 

Receiver Enabled

 

 

 

 

Transmitter Enabled

 

 

 

 

 

SET (1)

 

CLR (0)

 

Not Used

 

 

 

 

 

SET (1)

 

SET (1)

 

Not Used

 

 

 

 

 

Note: For bit and flag numbers, see “COM1 Stream Flags” and “COM2 Stream Flags” in “Appendix B” of the “ACR Motion Controller User’s Guide, Part 2.”

Table 2 Receive/Transmit Flags and COM Functions

Figure 1 ACRCOMM RS-422 Interface Schematic

– 4 – ACRCOMM and ACREXPAXIS User’s Guide