Pamux User’s Guide 121
TROUBLESHOOTING
AND TIPS
OVERVIEW
This appendix contains several procedures and notes to help you identify and resolve any troubles you
may experience with a Pamux system. If implementing the suggestions in this appendix does not
eliminate your difficulties, please contact Opto 22 Product Support (see Appendix D).
PRELIMINARY PROCEDURES
1. Check the 5V power at each Pamux mounting rack (check at the unit, not at the power supply).
The voltage should be between 4.9 VDC and 5.1 VDC. The 5 Volt “-” terminal must not be
grounded.
2. Check the +15V and -15V power at each analog Pamux mounting rack. Each power supply has
a tolerance of ±0.25 VDC.
3. Ensure that the address, reset level, and watchdog jumpers are installed to meet your
specifications. Each Pamux unit must have a unique address. All units must have the same
reset level.
4. Use only flat-ribbon cable (see Appendix B). Do not use rolled-ribbon or bundled-wire cable.
5. Verify that the last Pamux unit has a terminator board (TERM 1 or TERM2) installed and that
the terminator board is properly connected to 5 VDC.
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