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943-227-15 Digital Preamplifier
Operator Manual
3-5
For UDR systems, the address of the 942-200-80 Communications board in the UDR must be set 4040
and the baud rate must be set to 4800 baud. If the wiring of the Communications option board to the P2
connector is suspected, a loop test can be performed as described in "Loop Test Mode". The instruction
manual for the Communications option board (P/N 942-200-80-1) contains information on how to set up
the serial board in the UDR.
Firmware Version
This system requires a PROM for operation. For the part number and the latest revision of the PROM,
see the Factory Test Data Sheet. This Manual has been prepared for use with the P/N 227LNK, Rev. 2,
PROM.
3.4 Configuration Functions
The preamplifier configuration jumpers and required settings for this application are listed below:
Table 3-2. 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 3-3. 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 3-4. 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