WaveWare Adaptive Serial LED Clock - Manual (Page 8)

ALPHA Serial Clock Manual
2
Master/Slave modes
The Alpha
®
serial clock can either operate in master or slave mode. A
clock set to master mode sends out the time once each minute to all of the
other clocks on a network. A clock set to slave mode is ready to receive
the time from the master clock or a PC (personal computer). On a
network, only one clock should be set to master—all other clocks should
be set to slave mode. On a network attached to a PC, all clocks should be
set to slave mode.
The master/slave switch is located on the back of the clock, next to
the 12/24 hour switch (See Figure 1: Serial Clock—Rear Panel).
To change the master/slave mode settings, first remove the adapter
from the wall outlet, set the master/slave switch to the desired setting,
and re-insert the adapter into the wall outlet.
The slave mode setting can also be set using the #5 DIP switch. If the
#5 DIP switch is set to ON, the clock will operate in slave mode,
regardless of the setting of the master/slave switch. If the #5 DIP switch is
set to OFF, the clock will operate in the mode specified by the master/
slave switch on the back of the clock. This DIP switch capability is
provided in order to make it more difficult for unauthorized personnel to
change a clock from the slave mode to the master mode. (See Figure 6:
Setting the DIP Switches on page 10 for more information.)