Universal Desktop Box

RedHat Linux Platform
WindowsNT Platform
Netscape Server Platform

Technical Specifications
Linux Test Drive

Memory Configuration
Cache Configuration
SROM LED Codes
Spares Part Numbers
Troubleshooting

Universal Desktop Box
Serial Y Cable

All 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)

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 1 
Pin 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