Kinetis MicrocontrollersのトピックIssues on Kinetis K40 - UART https://community.nxp.com/t5/Kinetis-Microcontrollers/Issues-on-Kinetis-K40-UART/m-p/243934#M6212 <HTML><HEAD></HEAD><BODY><P>Hi</P><P>&nbsp;&nbsp;&nbsp;&nbsp; I am having KwikStik K40 device. In that we are communicating with the SIM module(SIM900A) through UART. The SIM module has RS232 port. And we have checked using MAX232 to transmit and receiving the signals. It can transmit and receive when we loop back the TXD and RXD signals in K40. But it fails to work if we connect it to the SIM module. Whether we want to use RS232 protocol or RS485 protocol. If it is RS485 what type of level translator to be used.</P><P>Thank you.</P></BODY></HTML> Thu, 28 Mar 2013 05:23:50 GMT abulhasan 2013-03-28T05:23:50Z Issues on Kinetis K40 - UART https://community.nxp.com/t5/Kinetis-Microcontrollers/Issues-on-Kinetis-K40-UART/m-p/243934#M6212 <HTML><HEAD></HEAD><BODY><P>Hi</P><P>&nbsp;&nbsp;&nbsp;&nbsp; I am having KwikStik K40 device. In that we are communicating with the SIM module(SIM900A) through UART. The SIM module has RS232 port. And we have checked using MAX232 to transmit and receiving the signals. It can transmit and receive when we loop back the TXD and RXD signals in K40. But it fails to work if we connect it to the SIM module. Whether we want to use RS232 protocol or RS485 protocol. If it is RS485 what type of level translator to be used.</P><P>Thank you.</P></BODY></HTML> Thu, 28 Mar 2013 05:23:50 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Issues-on-Kinetis-K40-UART/m-p/243934#M6212 abulhasan 2013-03-28T05:23:50Z Re: Issues on Kinetis K40 - UART https://community.nxp.com/t5/Kinetis-Microcontrollers/Issues-on-Kinetis-K40-UART/m-p/243935#M6213 <HTML><HEAD></HEAD><BODY><P>From google:</P><P><A href="http://en.wikipedia.org/wiki/RS-485" title="http://en.wikipedia.org/wiki/RS-485">RS-485 - Wikipedia, the free encyclopedia</A></P></BODY></HTML> Thu, 28 Mar 2013 13:09:46 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Issues-on-Kinetis-K40-UART/m-p/243935#M6213 JimDon 2013-03-28T13:09:46Z Re: Issues on Kinetis K40 - UART https://community.nxp.com/t5/Kinetis-Microcontrollers/Issues-on-Kinetis-K40-UART/m-p/243936#M6214 <HTML><HEAD></HEAD><BODY><P>post a link to the datasheet for the SIM900A</P><P></P><P> <EM>Whether we want to use RS232 protocol or RS485 protocol. </EM>neither RS232 nor RS485 are protocols</P><P></P><P> If it is RS485 what type of level translator to be used. surprise! a RS485 transceiver</P><P></P><P>Erik</P></BODY></HTML> Fri, 29 Mar 2013 14:32:37 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Issues-on-Kinetis-K40-UART/m-p/243936#M6214 erikmalund 2013-03-29T14:32:37Z