System information

Special Registers
EPM-15 Reference Manual 44
RS-485/422 Transmit/Receive Control Register
RS485/422 (READ/WRITE) 1DAh
D7 D6 D5 D4 D3 D2 D1 D0
Reserved COM4TE485 COM4RE4XX COM4TE422 Reserved COM3TE485 COM3RE4XX COM3TE422
Table 19: RS-485/422 Tx/Rx Register Bit Assignments
Bit Mnemonic Description
D7 Reserved This bit has no function.
D6 COM4TE485 COM4 RS-485 Transmit Enable — Controls RS-485 Tx on COM4.
0 = Disable RS-485 transmitter on COM4.
1 = Enable RS-485 transmitter on COM4.
D5 COM4RE4XX COM4 RS-485/422 Receive Enable — Controls RS-485/422 Rx on COM4.
0 = Disable RS-485/422 receiver on COM4.
1 = Enable RS-485/422 receiver on COM4.
D4 COM4TE422 COM4 RS-422 Transmit Enable — Controls RS-422 Tx on COM4.
0 = Disable RS-422 transmitter on COM4.
1 = Enable RS-422 transmitter on COM4.
D3 Reserved Reserved — This bit has no function.
D2 COM3TE485 COM3 RS-485 Transmit Enable — Controls RS-485 Tx on COM3.
0 = Disable RS-485 transmitter on COM3.
1 = Enable RS-485 transmitter on COM3.
D1 COM3RE4XX COM3 RS-485/422 Receive Enable — Controls RS-485/422 Rx on COM3.
0 = Disable RS-485/422 receiver on COM3.
1 = Enable RS-485/422 receiver on COM3.
D0 COM3TE422 COM3 RS-422 Transmit Enable — Controls RS-422 Tx on COM3.
0 = Disable RS-422 transmitter on COM3.
1 = Enable RS-422 transmitter on COM3.