Factory Test Mode
Back-panel DIP switch 4 allows a factory test mode to be enabled. During normal operation switch 4 should remain in its off (down) position. When switch 4 is in its on (up) position factory mode is active. En- abling this mode will result in the following operating condition: during an auto null sequence the associated 4-wire output channel will remain active. This will allow the tones associated with the nulling pro- cess to be present on the 4-wire output. While not appropriate during actual Model 46 use, it is interesting to “hear” the null- ing process take place. But unless direct- ed by factory personnel switch 4 should remain in its off (down) position.
Technical Notes
Software Version Display
A special Model 46 power-up sequence allows the unit’s software version number to be displayed. This is useful when work- ing with factory personnel on application support and troubleshooting situations. The four status LEDs associated with interface 1 are used to display the major release number with a range of 1 through
4.The four status LEDs associated with interface 2 are used to display the release sub-number which again ranges from 1 through 4. Refer to Figure 9 for a detailed view of the status LEDs and the corre- sponding software version numbering scheme. The Model 46’s initial software release is version 1.1 which is represented by the bottom LEDs of each status column being lit.
