Microtel Series 500 - Manual (Page 57)

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VII.D. CPU Clock Battery
The CPU contains a Real Time Clock which is powered through long term power
outages by an on-board 3 volt lithium cell. If this lithium cell ever measures less than
2.5 volts when measured with a standard digital volt meter, it is need of replacement.
When replacing or installing a new lithium cell, be certain the polarity of the battery is
correct. Failing to do so may cause damage to the CPU card circuitry. Additionally be
certain that JMP-1, the battery enable jumper, is installed correctly so that it enable the
battery to properly power the clock and memory circuits on the card.
VII.E.
I/O EXPANSION
To utilize more than three (3) I/O cards, a second RV Memory card must be installed.
The RV Memory supplied with a device enable jumper. The enable jumper should be
set for “Dev 3” on card allowing the usage of the I/O slots 1, 2, and 3. The enable
jumper for the second RV Memory should be set for “Dev 4” to allow usage of the I/O
slots 3 and 4. After the I/O card selection has been initialized (Reference section III.E),
the unit is ready for programming
VII.F
Customer Service
If problems develop with the system or with the installation process, call Microtel at 504-
276-0571.