Item Description OPT 8A 8-port RS-232 connection box with TxD, RxD LEDs (board-side: DB62 male x 1; device-side: DB25 female x 8) OPT 8A+ 8-port RS-232 connection box with TxD, RxD LEDs (board-side: DB62 male x 1; device-side: DB25 female x 8) OPT 8B 8-port RS-232 connection box with TxD, RxD LEDs (board-side: DB62 male x 1; device-side: DB25 male x 8) OPT 8B+ 8-port RS-232 connection box with TxD, RxD LEDs (board-side: DB62 male x 1; device-side: DB25 male x 8) OPT 8S 8-port RS-232 connection box with TxD, RxD LEDs, 25 KV ESD protection, and 2 KV EFT protection (board-side: DB62 male x 1; device-side: DB25 female x 8) OPT 8S+ 8-port RS-232 connection box with TxD, RxD LEDs, 25 KV ESD protection, and 2 KV EFT protection (board-side: DB62 male x 1; device-side: DB25 female x 8) OPT8-M9 8-port RS-232 connection box with TxD RxD LEDs (board-side: DB62 male x 1; device-side: DB9 male x 8) OPT8-M9+ 8-port RS-232 connection box with TxD RxD LEDs (board-side: DB62 male x 1; device-side: DB9 male x 8) OPT8-RJ45 8-port RS-232 connection box (board-side: DB62 male x 1; device-side: 8-pin RJ45 x 8) OPT8-RJ45+ 8-port RS-232 connection box (board-side: DB62 male x 1; device-side: 8-pin RJ45 x 8)