Keri Systems BioPointe Users Manual User Manual
Page 57
Communicating with the BioPointe
56
[NOTE]
In RS422/485 mode, it is necessary to install termination resistors at both ends of the communication lines. The value of
each resistor should equal the characteristic impedance of the signal wires (approximately 120 Ohms). No resistors are
installed at the factory.
Step 3: Configure type of serial interface with SW3
The BioPointe supports three different signal types – RS232, RS422 and RS485. Depending of which signal
type you are using, the device has to be configured correspondingly. The configuration is done through the 8-
way DIP switch, SW3. The table below shows the different settings.
Switch No./
Serial Interface
Type
1
2
3
4
5
6
7
8
RS232*
-
-
-
ON
-
ON
-
ON
RS422
-
ON
ON
-
ON
-
ON
-
RS485
ON
-
ON
-
ON
-
ON
-
* - Default setting
Step 4: Configure the type of communication and the baud rate with SW2
The baud rate is configured through switches 1 and 2 of SW2 as shown in the table below:
Switch /
Baud Rate (Bps)
1 2
38400*
ON
ON
19200
-
ON
9600
-
-
2400
ON
-
*- Default setting
For multi-drop networks (RS422 and RS485), devices do not respond to commands that are not addressed to
it. In order for the BioPointe to respond correctly, you need to set the type of communication using switches
3 and 4 of DIP SW2 as shown in the table below:
Switch /
Comm Type
3 4
RS232*
ON
ON
Modem
ON
-
TCP/IP
-
ON
RS422 / 485
-
-
*- Default setting