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Connections and Configuration
D20ME II Jumpering
JP1 -
This jumper sets the Master or Slave function of the board on the VME bus.
VME Control
Note:
JP2 -
JP2 is a group of four jumpers that set the VME bus address of the board. The
VME Address
address should reflect the board location in a D200 CCU chassis.
Example: The board with address 1 will be the lead node, with nodes 2 through 8
Note:
JP3-1 and
These two jumpers determine the Real-Time Clock (RTC) source for each D20ME
JP3-2
II board in a CCU:
RTC Options
•
Single-node D20s and the first, or lead, node of a D200 both use an internal
clock.
•
Non-lead nodes of a D200 synchronize the clocks to the clock of the lead node.
Table: JP4 -
This two-position jumper enables or disables the hardware Watchdog.
Watchdog
Note:
Enable/Disable
JP4
Pin 1 = SLOWCK
Pin 3 = /WD
The D20ME II card has two 3.6V Lithium batteries, Tadiran® TL-2150 or
Table: JP8 –
Battery Backup
equivalent, to maintain NVRAM contents in the event of a power failure.
Enable/Disable
Important: Disconnect the batteries if you are storing the board for extended periods
Jumper
General
Full
, continued
, continued
Single-node D20 systems are always set to Master.
positioned to the right of the lead node.
Single-node D20s are set to address 0 (all jumpers IN).
Never leave the Watchdog disabled during normal D20ME II operation.
Jumper
Position
pin 1 to 2
(center)
pin 3 to 2
(center)
of time.
Position
JP8
pin 1 to 2
pin 3 to 2
pins 4 to 5
Installation and Operations Guide
Disables the hardware Watchdog.
Enables the hardware Watchdog.
Function
Disconnects the batteries from the NVRAM
Connects the batteries to the NVRAM
Always jumpered
994-0078-2.00-7
D20/D200
Function
47
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