Installation manual

FuelMaster
®
Installation Manual
97
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8. Tank Monitor Interface (see Figures 4-22 and 4-23). 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.
Tank monitors use differing connectors. Most receive inputs through a DB25 connector. Some
receive inputs through a DB9 serial connector, and others use RJ-11 or RJ-45 connectors. Some
tank monitors have a built-in RS-232 connection. Others require the purchase of an RS-232 option.
If communications are not achieved after making these connections, try reversing transmit and
receive connections.
Wireless communications are possible. The use of B&B Electronics Zlinx Radio Modems is
described in Product Bulletin 133. A kit including a pair of Zlinx Radio Modems is available from Syn-
Tech under part number 249912.
Perform the following:
a. If RS-232 cable is used, the circuit board trace between E1 and E2 at the bottom of the I/O Silver
Board must be cut to create an open. If RS-422 cable is used, the circuit board trace between
E2 and E1 at the bottom of the I/O Silver Board must be intact.
b. Two TMU SELECT jumpers must be installed on S2 and S3 of the Satellite I/O Control Board.
Positions are dependent upon the use of RS-232 (upper two pins) or RS-422 (lower two pins).
c. A 201839 ribbon cable must be connected between J4 on the Satellite I/O Control Board, and
JP14 on the I/O Silver Board.
d. For RS-232:
1) Pull an RS-232 cable from the tank monitor to the FMU. If pulled in a conduit with other low
voltage cables, it is recommended the cable be shielded.
2) At the FMU, connect the cable to pins 1 (IN+), 3 (GND), and 5 (OUT-). Note the color coding
to correctly match the connections to the tank monitor.
3) At the tank monitor the appropriate connector must be installed to make the connection. The
conductor routed from pin 1 should connect to transmit (TX). The conductor from pin 3 should
connect to ground (GND). The conductor from pin 5 should connect to receive (RX).
e. For RS-422:
1) Pull an RS-422 cable from the tank monitor to the FMU. If pulled in a conduit with other low
voltage cables, it is recommended the cable be shielded.
NOTE
The GND pin is for connection of a cable drain. It is connected only on one end (either end). The other end is
bent back over the cable and taped (not connected).
2) At the FMU, connect the cable to pins 1 (IN+), 2 (IN-), 3 (GND), 4 (OUT+), and 5 (OUT-).
Note the color coding to correctly match the connections to the tank monitor.
3) At the tank monitor the appropriate connector must be installed to make the connection. If the
tank monitor will accept RS-422, the conductor routed from pin 1 should connect to OUT+.
The conductor from pin 2 should connect to OUT-. The conductor from pin 3 should be bent
back over the cable and taped. The conductor from pin 4 should connect to IN+. The
conductor from pin 5 should connect to IN-. If the tank monitor will not accept RS-422, an RS-
422/232 converter will be needed. Follow the manufacturer’s recommendations for attaching
the converter. Product Bulletin 69 describes the connection of a Patton Electronics 222N.
f. Check the communications parameters set in the tank monitor: data bits, stop bits, parity, and
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