Syn-Tech Systems FuelMaster FMU-2500 Classic Installation Manual page 60

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Communications to a TMU may originate in a Master FMU with either RS-232 or RS-422 communications. If
the TMU is located beyond the range of RS-232 communications, and the TMU will not accept an RS-422
input, an RS-422 cable may be routed from the Master FMU to the TMU control box, then an RS-422 to RS-
232 converter can be used to step the RS-422 signal down to RS-232. Syn-Tech uses a Patton Electronics
222N Converter which has a DB25 connector to interface with a TMU. These converters are also available
with a DB9 connector, and models are available with 600W of surge protection. Retail prices from the
manufacturer start at approximately $50.
Communications parameters in the FMU must match those programmed into the TMU for successful data
exchange. Available communications options in the FMU are:
•
Baud Rates: 300, 1200, 2400, 4800, 9600, 19200
•
Data Bits, Parity, Stop Bits: 7Even1, 7Odd1, 8None1
Baud rate settings may be changed with a Supervisor Key or laptop connection. All other settings must be
made with a laptop connection.
Satellite/EIU Communications
•
Satellite communications must be to a Master FMU. Satellite communications cannot be "daisy-
chained" from one Satellite FMU to another.
•
Satellite interfaces to a master FMU may be through wireless communications. Product Bulletin 133
describes a wireless communications option.
•
The NEC states, "Communication conductors shall not be placed in any raceway, compartment,
outlet box, junction box, or similar fitting with conductors of electric light, power, Class 1, non-power-
limited fire alarm or medium power network-powered broadband communications circuits." Ref:
NFPA 70, para 800.133(A)(1)(c).
•
If a Satellite connection is added to an existing master FMU, and that FMU already has an I/O Silver
Board installed, be sure to specify the current application (i.e., Tank Monitor Interface) of the I/O
Silver Board when placing an order for a Satellite Option.
Satellite FMUs and EIUs are controlled by Master FMUs; they cannot operate independent of a Master
FMU. [Exception: DoD Satellite FMUs can operate independent of a Master FMU if the Master FMU
becomes unserviceable after initially installed and configured]. Control is attained through RS-422 (or
wireless) communications between a master FMU and controlled satellite FMUs, to include EIUs. Both
master and satellite FMUs must be equipped with a Satellite Option (STS part number 200034A) to accept
the wire terminations and provide the necessary internal interface cables. This option is not required with an
EIU. EIUs have other provisions for connection to a master FMU.
See Figure 3-5. When satellite FMUs or EIUs are connected to a master FMU, the interface is detected by
the installation of jumpers on the SATELLITES INSTALLED JUMPERS on position S1 of the Satellite I/O
Control Board. Eight jumper positions are provided, and they are numbered 1 through 8. Jumpers must be
installed to correspond with the RS-422 cable connection to the I/O Silver Board (a component of the
Satellite Option). The I/O Silver Board may have up to eight RS-422 cable connections corresponding to
eight satellite connector receptacles. These receptacles are labeled 1 through 8. A jumper must be installed
in each jumper position of the Satellite I/O Control Board which corresponds with a receptacle position on
the I/O Silver Board. Example: if satellite connectors are plugged into positions 1, 2, 3, and 4 of the I/O
Silver Board, jumpers must be installed in jumper positions 1, 2, 3, and 4 of the SATELLITES INSTALLED
JUMPERS. This applies to both master and satellite FMUs. Master FMUs may have multiple connections
for multiple satellites. Satellites will only have one connection. If a position on the I/O Silver Board becomes
non-operational, and the connection is moved to another receptacle,the corresponding jumper must also be
moved on the Satellite I/O Control Board. Jumpers are not installed in EIUs.
FuelMaster
®
Installation Manual
NOTE
58