WI-GTWY-9-xxx Wireless Gateway V1.18
61
Setting the Clock
The clock within the WI-GTWY-9-xxx can be set by the host device, and read by the host
device. The WI-GTWY-9-xxx provides four clock registers for days/hours/minutes/seconds - the
registers are 4330 – 4333. On power-up, these registers are set to zero. Reg 4333 increments
each second, Reg 4332 increments each minute, Reg 4331 each hour and Reg 4330 each day.
The clock registers are used by the WI-GTWY-9-xxx for the real-time-clock trigger. The host
device can read these registers. The host device can also set the WI-GTWY-9-xxx clock at any
time by writing to the appropriate
Set
register. The
Set
registers are : 4340 – 4343. The procedure
for setting the real time clock via these registers depends on the module firmware version (to find
out what firmware version the module contains, simply display the diagnostics menu – see
section on diagnostics). The
set registers
can also be set via radio using appropriate I/O or block
mappings.
Item
Clock Location
Set Location
Days
4330
4340
Hours
4331
4341
Minutes
4332
4342
Seconds
4333
4343
Firmware versions up to 1.50:
Registers 4340 – 4343 are normally zero. When a value is written into one of these registers, the
WI-GTWY-9-xxx copies the value into the corresponding clock register, and then sets the
Set
register back to zero. For example, if the host device writes a value of 7 into Reg 4341, the WI-
GTWY-9-xxx will write 7 into 4331 and set 4341 back to zero.
Firmware version 1.50 and later:
Registers 4340 – 4343 will only be transferred to the corresponding clock registers when their
value changes from 0. For example to write a value of 7 to the hours register, first write the value
0 to the
Set hours
register 4341, then write the value 7 to the same register. (i.e. by always first
writing the value 0 to the
Set
register this ensures that the change-of-state from 0 will be
detected). Values must be held (i.e. not change) for approx 200msec to be detected.
