Features： 1、[DB9 TERMINAL] DB9 female adapter screw terminal, suitable for RS232 RS485 standard interfaces. 2、[9 POSITION] The terminal breakout board has 9 position screws, which refer to multiple functions. 3、[ MATERIAL] Selection of components, with high conversion performance and smooth communication. 4、[MULTIPLE MODES] With Carrier detection, sending and receiving data, clear sending and ringing reminder functions. 5、[COMPACT SIZE] The screw terminal block is small and compact, easy to install and does not take up space. Specification： Item Type: Terminal Breakout Board Board Size: Approx. 33 x 25mm / 1.3 x 1in Pin Definition Symbol 1 Data Carrier Detect DCD 2 Received Data RXD 3 Transmit Data TXD 4 Data Terminal Ready DTR 5 Signal Ground SG 6 Data Set Ready DSR 7 Request To Send RTS 8 Clear To Send CTS 9 Ring Indicator RI Package List： 1 x Terminal Breakout Board