Sensoray 526 - Manual (Page 12)

12
Watchdog enable/disable
Watchdog enable/disable is controlled by bit [3] of the Watchdog Timer Control register and
jumper 1 of J4.
Shunt in position 1 of J4 Bit [3] of Control Register Watchdog timer
Not installed 0 Disabled
Not installed 1 Enabled
Installed 0 Enabled
Installed 1 Disabled
Bit [3] is always 0 after power up, so if the watchdog timer has to be enabled by default, the
shunt has to be installed.
Solid-sate relay control
The polarity of the watchdog timer output signal (CONTROL on Fig.3) is controlled by bit [4] of
the Watchdog Timer Control register and jumper 2 of J4. When CONTROL is not active, each
solid-state relay is in its default (normal) state. When CONTROL becomes active, the solid-state
relays change their states.
Solid-state relay control Shunt in position 2 of J4 Bit [4] of Control
Register
Timed out Not timed out
Not installed 0 Active Not active
Not installed 1 Not active Active
Installed 0 Not active Active
Installed 1 Active Not active