Posted 6 Apr 2005 Hi, Anybody can help me about AJ module installation ? The existing system is using A3A CPU with MELSECNET II (optical cable). In 1 of remote station, it have 1 module AJ72P25. I want to add 1 module AJ71UC24 for RS232/RS422 communication with PC, but unfortunatelly the new module can't work properly. Is it possible to install 2 units AJ module on same base unit ? The address of new AJ72P25 is 080 ~ 09F. I added on software [TOP H8 H10B K1 K1] and [TOP H8 H10F K1 K1]. The first command is for disable RS232 CD terminal check function and second is for half-duplex transmission. Thank you Share this post Link to post Share on other sites