Electro Standards Laboratories DB9 A/B Automatic Fallback Switch Model 7125

The PathWay® Model 7125 DB9 A/B Automatic Fallback Switch with Contact Control Remote Port, allows the user the capability of sharing a single port interface device connected to the COMMON port among two other devices connected to the A (PRIMARY) and B (SECONDARY) ports with remote access functionality. Remote Control access can be accomplished through the Contact Closure REMOTE Port. When in automatic fallback mode (AUTO), the unit monitors data activity on the PRIMARY port. If activity is lost, the unit switches to the SECONDARY port (B) until data activity is detected on PRIMARY port (A), at which time the unit will automatically return to the "A" position. If no data is present on either the PRIMARY port (A) or on the SECONDARY port (B), the unit will stay in the "B" position and continue to monitor for data. The user can override automatic fallback operation from the front panel or from the Remote Port and force the unit to operate as an A/B switch.