Four Channel, Serial (RS232/422/485) (Module P8) /Isolated RS-422/RS-485 (Module PC)68C3 Operations Manual North Atlantic Industries, Inc. 12/19/2014Rev: 2014-12-19-0947 www.naii.com Page 95 of 330Channel Control LowType: binary wordRange: not applicableRead/Write: R/WInitialized Value: 0This register is used to for channel control configuration.REGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FUNCTIONCONTROL LO 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 RTS/GPIO 110 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 CTS/GPIO 21,30 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 TRISTATE TRANSMIT LINE 40 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 SET/RELEASE BREAK0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 RESET CHANNEL FIFOs & UART20 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 CLEAR Rx FIFO21 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 CLEAR Tx FIFO2Notes: 1. Disable D0 through D4 to enter GPIO control. RTS/CTS as GPIO when RTS/CTS Flow Control disabled.2. When Reset/Clear is done after commanded, bit is set to 0.3. Read-only4. Tristate Transmit Line – used primarily in half-duplex, multi-drop or RS-485 type applications – when set to “1”, willautomatically set the channel transmitter to high-Z state after data transmission.Channel Control HighType: binary wordRange: not applicableRead/Write: R/WInitialized Value: 0This register is used to for channel control configuration.REGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 FUNCTIONCONTROL HI 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 Tx INITIATE10 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 Tx ALWAYS (ASYNC ONLY) 20 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 ENABLE RECEIVER0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 Clear Termination Char Rcvd1 Firmware will clear bit when all data from TX Buffer is transmitted. Use for applications desiring pre-load of TxBuffer and thencommand/control/trigger transmission.2 When Tx ALWAYS is set to “1”, transmission will occur as soon as data is placed in Tx Buffer
