On instruments fitted with both the Z-Purge and RS-
422 options, the RS-422 connection is made through a
nine-pin male D subconnector located inside the SPM
5.5.2 Pin Designations
The chart and illustrations show SPM pin designations
for both standard SPM units and for Z-Purge units. For
Z-Purge systems, the numbered connectors are directly
matched. Both portions of the connector are provided.
Be careful when soldering cable to connectors.
Improper solder joints and/or solder splashes will
cause communication errors and possible damage
to the system.
At Standard SPM
5.5.3 General System Wiring
Wiring locations should be identified and wired per local
electrical code before attaching connectors to the cables.
The RS-422 standard recommends shielded 24 AWG
copper conductor or twisted telephone cable with a shunt
capacitance of less than 16 pF per foot.
SPM Technical Handbook
At Z-Purge SPM (Internal)
SPM Single Point Monitor
Secure all housings to the interface connectors
using the clamping screws provided on the
housing. Use of the clamping screws will prevent
5.5.4 How to Set Date and Time
The internal clock/calendar is factory set for Central
Standard Time. Time is displayed in 24-hour format, and
leap year is automatically updated.
1. Make sure main power switch (8) is on.
2. Open tape load lever (18).
3. The digital display (19) will show either (AC LINE)
(for line systems) or (BATTERY CONDITION) (for
battery backup/portable systems).
4. Press and hold alarm test key (10) until the date
shows on the display. The format is MM/DD/YY.
The field that is blinking is to be changed.
5. Press alarm reset (11) to change the number in
the blinking field. When the field is correct, press
alarm test (10) to move to the next field.
6. Continue by alternating alarm test (10) and alarm
reset (11) to move to new fields and to change
numbers in the blinking field. After setting the
correct date, the display changes to time of day
in the format HH:MM.
7. Press and hold alarm test (10). The display (19)
will show (TIME SET) to confirm the new entry. If