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The Atlas Fuel System
CPU Switch Settings (Series 9800 Only Including DEF 9862 Units)
Page 3-18
MDE-4363G Atlas™ Fuel Systems Owner’s Manual · August 2018
CPU Jumpers (or SW1 for Older CPU Boards)
SW1-1 or JP1: Baud Rate
This switch is set to reflect the communications rate of the Gasboy RS-485 pump loop. It is:
• Open for 9600 baud
• Closed for 1200 baud
The Gasboy CFN system and TopKAT
™
communicate at 9600 baud.
SW1-2 or JP2: Mode
If the Series 9800 is controlled by a Gasboy CFN, CFN Plus, TopKAT Plus, TopKAT
top-mount, or TopKAT electronic fuel management system, the switch must open (on-line
mode). If the Series 9800 is controlled by a Gasboy Series 1000 or TopKAT mechanical
system, or controlled by any non-Gasboy system, or not controlled by any fuel management
system at all, the switch must be closed (standalone mode).
Note: The 9800K is shipped in the standalone mode unless it has the TopKAT top-mount
option. With the TopKAT top-mount option, the unit is shipped in on-line mode.
SW1-3, SW1-4 or JP3, JP4: Delay Time
These two switches set the delay time used by leak detectors in submersible pump
applications. The delay time is the period between the activation of the submersible pump and
the activation of the slow flow valve. This time must be set according to the type of leak
detector installed on the submersible pump to allow a normal leak test for each transaction.
The delay time must be set to zero seconds for suction pumps.
Baud Rate
SW1-1/JP1
Fuel System
9600
Open
CFN
TopKAT top-mount
TopKAT electronic
1200
Closed
None currently supported
Mode
SW1-2/JP2 Fuel System
On-line
Open
CFN
TopKAT top-mount
TopKAT electronic
Standalone Closed
Series 1000
TopKAT Mechanical
All non-Gasboy systems
No fuel system
Delay Time
SW1-3/JP3
SW1-4/JP4
0 seconds
Closed
Closed
4 seconds
Closed
Open
5 seconds
Open
Closed
6 seconds
Open
Open