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RedHat LinuxWindowsNT Platform Netscape Server Platform Technical Specifications Linux Test Drive |
SERIAL Y CABLEAll Universal Desktop Boxes are equipped with two 16550A compatible serial interfaces with full modem control, unfortunately due to the compact packaging of the UDB there is insufficient space available to incorporate two serial port sockets on the rear of the system. The Digital solution to this problem is to provide a single male DB25 socket with two sets of signals present. The first Port A is presented on the standard RS-232 pins, the second Port B is presented on pins that are normally unused by the RS-232 standard. A special Y Cable is available from Digital that splits these signals onto two sockets with standard pinouts. The part number for this cable is B25X-1F (17-04047-01 A01) Note that a Y cable is not required if you only need to use a single serial port for a modem. Should you wish to make your own cable, or need other connections the pinout of the male DB25 socket on the UDB is as follows. Note that pin 7 GND is shared between Port A and Port B. Pins are counted right to left with pin 1 top right as you look into the connector with pins pointing out at you, pin 14 is below pin 1Pin Signal 2 Port A TXD 3 Port A RXD 4 Port A RTS 5 Port A CTS 6 Port A DSR 7 Port A GND 8 Port A DCD 20 Port A DTR 22 Port A RI 7 Port B GND 11 Port B DTR 12 Port B DCD 13 Port B CTS 14 Port B TXD 16 Port B RXD 19 Port B RTS 23 Port B DSR 25 Port B RI |
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