DSX Access Systems, Inc.

DSX-SPS / 2PC

DSX-SPS Serial Port Switcher Typical Drawing

The DSX-SPS Serial Port Switcher is the hardware that physically switches serial ports from a Primary Comm Server to a Backup Comm Server. This occurs in conjunction with the Hot Swap Comm Server software that monitors the Primary Comm Server. When the Primary Comm Server fails, the Backup Comm Server computer takes over. It sends an ASCII string to the SPST module telling it to activate. The SPST in turn signals the individual 2PC modules to switch from Primary to Secondary serial ports. When the Primary Comm Server is back on line, the Backup Comm Server sends another string to the SPST to deactivate, thereby switching everything back to the Primary serial ports. Up to 10 DSX-2PC modules can be used with a DSX-SPS to switch a total of 20 serial ports.

Serial Port Connections

DB-25 DB-9

TX 2 3

RX 3 2

Gnd 7 5

DTR 20 4