B&B Electronics Switch RS-485 Manuel D’Utilisation

6

485SDA103798 Manual

This chapter will cover the connections required for the

485SDA10.  There are four sets of connections:

•

 A/D converter

•

 Digital I/O

•

 Serial port

•

 Power supply

Do not make any connections to the 485SDA10 until you have read
this chapter.
CAUTION: When making electrical connections it is important to
power down the devices being connected.  If this is not possible,
precautions must be taken to ensure electrical specifications are not
exceeded.
NOTE: If you do not intend to use a section (A/D or I/O), it is still
important to read each one.

The A/D connections are made on the I/O port, which is a DB-

25S (female) connector.  Table 2.1 shows the pinout of the I/O port.
The next sections explain the functions and connections for the
various analog signals.

These are the analog input channels.  The analog data that is

read from the 485SDA10 is related to the voltage on these pins.
Connect your devices to the analog input channels.   Voltages on
these inputs must remain between 0 and 5.0V DC.  Connect unused
A/D inputs to analog ground.

The voltage connected to this pin determines the upper end of

the input voltage range.  For proper operation, this pin must be
connected to a DC voltage between +2.5 and +5.0 Volts.  The
485SDA10 provides a 5.0V +/-0.5% reference on pin 17. The 5V
reference can be used if you require a 0 to 5V DC input range.  If
your application requires a better reference voltage or a different
input range, you must supply the appropriate reference to the
A/D Ref Input+ pin.  This voltage must be at least 2.5V greater
than A/D Ref Input-.  Bypassing the A/D Ref Input+ pin with 0.01

µ

F

ceramic and 10

µ

F tantalum capacitors to analog ground will

decrease noise levels.