I have an old terminal without a CTS line. If I hook up my laptop running Teraterm 2400,7N1 to the terminal and use a null modem cable I can type characters in the laptop and they appear on the terminal and if I type characters in the terminal they appear on the laptop. If I attach an ESP82660 WIfi modem to the laptop running teraterm I can connect, etc to use the WIFI - i.e. connect to a telnet service (ATDT bbs.fozztexx.com or towel.blinkenlights.nl). If I attach the same ESP82660 to the terminal, the ESP transmits to the terminal fine (to show the initial connection screen) but I when I type characters (such as ATZ) they do not appear on the display and I thus believe do not transmit, thus no echo back from the ESP. SO, there is something in the config of the ESP that is not happy. I have the terminal and laptop set for 2400,7N1. The pins of the terminal are 1 - ground 2 - transmitted data 3. - receive data 4 - rts 7 signal ground 8 data carrier detector 11 reverse channel transmit data 12 reverse channel receive data 18 read only data 20 data terminal ready. I am working on this, but any tips would be appreciated. Do I need Mark or Space parity? Bill