Linx Technologies MDEV-LICAL-MS - Manual (Page 6)

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The Encoder Board
The encoder board has two sections that are of primary interest: the
encoder area and the transmitter area.
The Encoder Area
Figure 5 shows the encoder area of the development board.
The encoder is placed in the center beneath the Linx logo. To the right are
buttons that pull the encoder data lines high when pressed. Button S0
corresponds to data line D0, S1 to D1 and so forth.
The diodes to the left isolate the data lines from each other while allowing
any line to activate the SEND line.
Beneath the encoder are two LEDs. D12 is connected to the MODE_IND
line and lights up as described in the MS Encoder Data Guide. D8 is
connected to the TX_CNTL line and provides visual feedback by lighting up
when the encoder sends a word.
Beneath the LEDs is a button that is connected to the CREATE line. This
button is used to create the Address and set the Control Permissions as
described in the MS Series Encoder Data Guide.
There are three function switches to the left of the CREATE button. BSEL0
and BSEL1 are used to set the baud rate of the encoder as described
in Figure 6. The maximum baud rate for the LR Series is 10,000bps, so
only 2,400 and 9,600bps can be used on boards populated with these
modules. The ES Series can use all four baud rates.
Figure 5: The Encoder Area
The PDN switch connects the TX_CNTL line of the encoder to the PDN
line of the transmitter so that the TX Control Mode of the encoder can be
tested. This mode is described in the MS Series Encoder Data Guide.
If a BSEL switch is up, then the line is high (1, VCC); if down, then the line
is low (0, GND). If the PDN switch is up, then the encoder’s TX_CNTL line
is connected to the transmitter’s PDN line; if down, it is not connected and
the LR Series transmitter is not activated unless its PDN line is pulled high
externally. The ES Series transmitter has an internal pull-up, so is active
unless pulled low.
Baud Rate Selection Table
SEL_BAUD1 SEL_BAUD0 Baud Rate (bps)
0 0 2,400
0 1 9,600
1 0 19,200
1 1 28,800
Figure 6: Baud Rate Selection Table
Note: The decoder board must be set to the same baud rate in order
for the signal to be received correctly. The maximum baud rate for the
LR Series is 10,000bps, so only 2,400 and 9,600bps can be used on
boards populated with these modules. The ES Series transmitter can
use all four baud rates. If the switch is up, then the line is high, if it is
down, then the line is low.