Figure 4-26. Redundant Fmus, One Dispenser, One Pulser - Syn-Tech Systems FuelMaster FMU-2500 Classic Installation Manual

Figure 4-26. Redundant FMUs, One Dispenser, One Pulser

If two FMUs are receiving pulses from one pulser, the PULSE FILTERING dip switches must be set the
same in both FMUs or quantity variations will show between the two FMUs.
If two FMUs are receiving pulses from one pulser, the PULSE FILTERING dip switches must be
set the same, or quantity variations will show between the two FMUs. See Figure 4-27, location
J (DS1), for the location of the PULSE FILTERING dipswitches on the Satellite I/O Control
Board. Numbering exists on both the dipswitch panel, and silkscreened on the board, and do
not agree. Follow the numbering silkscreened on the board.
9. Tank Monitor Interface (see Figures 4-28 and 4-29). Tank monitor interfaces are only possible to a
Master FMU equipped with a Tank Monitor Interface Kit, part number 202002A. Interface cable
connections at the FMU will be dependent upon the use of RS-232 (3-conductor) or RS-422 (2-pair
with drain) cable. In either case, connections will be made to a 5-pin connector in JP13 on the I/O
Silver Board. RS-422 may be necessitated by the length of the cable run. Many tank monitors do
not recommend RS-232 cable lengths in excess of 50 feet. Where excessive distances dictate the
use of RS-422, an RS-232/422 converter such as the Patton Electronics 222N (Syn-Tech part
number 219517) may be used to step down RS-422 to RS-232 with a DB25 connector for
connection to the tank monitor. Patton also makes an RS-422/232 converter with DB9, RJ-11, or
RJ-45 connectors for connection to the tank monitor. Syn-Tech does not inventory converters other
than with a DB25 connector. Patton advises the separation distance is extended to 4000 feet with
their RS-422/232 converters.
FuelMaster
®
Installation Manual
NOTE
100