Black Box 6-Port RS232 DB25 Passive Splitter: Electronics. Buy Black Box 6-Port RS232 DB25 Passive Splitter: Connectors & Adapters - ✓ FREE DELIVERY possible on eligible purchases. MASTER port is configured DTE and PORTS 1–6 are configured DCE . Signals present on the MASTER connector at pins 1, 3, 5, 6, 7, 8, 15, and 17 are sent to the corresponding pins on each of the PORT connectors. . Signals present on the PORT connectors at pins 2, 4, and 20 are passively stored and sent to the corresponding pins on the MASTER connector. . The total combined length of all cables connected to the unit should be less than 50 feet (15.2 m). . Data coming into the MASTER port on pin 3 of the RS232 DB25 Passive Splitter goes to all three Slave ports since they are all tied common. . The 6 Port RS22 DB2 Passive Splitter allows an RS22 DCE device, such as a modem, to interface with 6 RS22 DTE devices, such as terminals. Signals present on the MASTER connector are sent to the corresponding pins on each of the PORT connectors. . . .