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4
Figure 4 illustrates the DIP switch SW2 for switching between a GK-403 or Datalogger
application. "DATALOGGER"" is the default SW2 position:
GK-403
DATALOGGER
1.1 GK-403 Mode of Operation
The GK-403 mode of operation uses a single control line to select channels. This scheme
allows individual channels to be selected without having to sequentially advance through
all channels. Multiplexers can also be connected together in a daisy chain fashion using
the GK-403 protocol. In 16 channel mode, the number of clock pulses equals 2 times the
desired channel number. In 32 channel mode, the number of clock pulses equals the
desired channel number plus 1. Note the timing below for 16 and 32 channel switching
arrangements.
T1
T2
T3
T4
Clock
Channel Selected
Figure 5 - 16 Channel GK-403 Channel Selection Timing
SW2
Figure 4 – GK-403/DATALOGGER Selection
1
2
Timing:
T1 = min 20 usec
T2 = min 20 usec
T3 = min 40 µsec (25kHz)
T4 = 500 µsec
1
2
3
Channel 1
4
Channel 2
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