RXD and TXD- should idle low (going high at start of data transmission). RXD+ and TXD+ should idle high (going low at start of data transmission). * NOTE - RS-422 transmit and receive are balanced signals requiring two lines plus a ground in each direction. Only use if selected in SimplWindows program. Externally tie TX+ (Pin 4) and RX+ (Pin 3) togetherĭB9 Pinouts - Bi-Directional RS232, RS422, RS485Īll Crestron devices with the DB9-Male type COM ports (PRO2, AV2, MC2E, MC2W, MP2, MP2E, RACK2, C2-COM3, C2-COM2, CNMSX-PRO, CNMSX-AV, ST-COM, CNXCOM-2 cards, CNMSs and CNCOMH-2 cards) have the same pin configurations shown below.Externally tie TX- (Pin 2) and RX- (Pin 5) together.
3-Series COM Port Pinout - RS-485 Communication (*HALF-DUPLEX)Ĭonnections are the same as above with the following additions:
0 kommentar(er)
