Bennett 3000 Series - Contactor Board Components

Bennett 3000 Spec 300 Series Instruction Manual Service & Troubleshooting
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RS-485 RETAIL & RS485 FLEET FUEL COMMUNICATION (P/N 121992)
To be used with Allied NeXGen remote consoles for retail communication or a fleet management system for commercial use. The RS485
uses a 2-wire protocol. RS485 wires should be twisted together no less than 3 turns per foot to reduce the effects of electrical noise on
the communication circuit. Bennett highly recommends the use of twisted wires. Note: Belden shielded cable is accepted but the “drain”
must not be terminated.
RS-485 communication is achieved through terminal strips TS1 (side 1) and TS2 (side 2). The figure below shows the typical 819 CPU
Board layout for a RS-485 personality module.
COMPONENT DESCRIPTION
The following is a description of the terminal strips and pinouts used on the RS-485 personality module.
TS1 Side 1
Pin Description
1 (red) Data (+ positive)
2 (black) Data (- negative)
3 (green) Ground
TS2 Side 2
Pin Description
1 (red) Data (+ positive)
2 (black) Data (- negative)
3 (green) Ground
LIGHT EMITTING DIODES
There are several LEDs shown in the figure above can be used for troubleshooting. See below for more information.
LED
Color
Description
D2
Red
Side 1 Transmit
D5
Green
Side 1 Receive
D6
Yellow
Side 1 Transmit/Receive (Off = Transmit/ On = Receive)
D7
Red
Side 2 Transmit
D10
Green
Side 2 Receive
D11
Yellow
Side 2 Transmit/Receive (Off = Transmit/On = Receive)
The handle switch signal can be used to signal the console that the pump is “IN USE”. Some fleet systems require this signal and some do
not.
D2
TS1
D5
D6
TS2
D11
D10
D7