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943-227-15 Digital Preamplifier
Operator Manual
A-2
A.2 SWITCH AND JUMPER POSITIONS,
943-227-15 and 943-227-15VL
Table A-2. Preamplifier Serial Interface Board 977-210-10M Switch Settings
Switch Normal
Op.
Switch Function
SW1 Open Microprocessor Reset switch, momentary contac
t
SW2 N/A Not supplied
SW3-1 ON OFF Selects 300 baud • 1/ON Selects 4800 baud (normal setting)
SW3-2 OFF OFF • (No function is implemented in the 977-210-10M)
SW3-3 OFF OFF Selects Rate Mode (normal) • (Selects Maintenance Mode for
factory PGA and Auto Zero set-up only)
SW3-4 OFF OFF • (No function is implemented in the 977-210-10M)
NOTE
SW3 is a 4-position DIP switch on the 977-210-10M serial
interface board.
Table A-3. Jumper Positions for Preamplifier Serial Interface Board 977-210-10M
Jumper Normal
Setting
Function Alternate
Setting
Function
JMP1 A to B
Enables Victoreen Loop
(normal)
B to C Enables RS232C
JMP2 N/A Deleted, Not Used N/A Deleted, Not Used
Table A-4. Jumper Positions for Preamplifier Electrometer Board 977-200-15M
Jumper Normal
Setting
Function Cal.
Position
Function
JMP1 A to B Normal Operation B to C PGA Offset Adjust *
* Programmable Gain Amplifier requires a special test PROM and is a factory adjustment