Teltonika RUT9 Series User Manual

8.5.2 RS485
RS-485 is differential serial data transmission standart for use in long ranges or noisy environments.
Field name
Sample
Explanation
1.
Enabled
Enable/Disable
Check the box to enable the serial port function.
2.
Baud rate
300 / 115200
Selectthe communication speed of the serial interface.
3.
Data bits
5 - 8
Specifies how many bits will be used for character
4.
Parity
None / Odd / Even
Selectthe parity bit setting used for error detection during data
transfer.
5.
Stop bits
1 / 2
Specifies how many stop bits will be used to detect the end of
character
6.
Flow control
None / RTS- CTS / Xon-Xoff
Specifies what kind of characters to use for flow control
7.
Serial type
Console / over IP / Modem
/ Modbus Gateway
Specifies function of serial interface
8.5.2.1 Maximum data rate vs. transmission line length
RS-485 standart can be used for network lengths up to 1200 meters, but the maximum usable data rate decreases
as the transmission length increases. Device operating at maximum data rate( 10Mbps) is limited to transmission length
of about 12 meters, while the 100kbps data rate can achieve a distance up to 1200 meters.A rough relation between
maximum transmission length and data rate can be calculated using approximation:

max
(m) =
10
8
 (/)
Where Lmax is maximum transmission length in meters and DR is maximum data rate in bits per second.
Twisted pair is the prefered cable for RS-485 networks. Twisted pair cables picks up noise and other
electromagnetically induced voltages as common mode signals, which are rejected by the differential receivers.
85

Teltonika RUT9 Series Specifications

General

Brand	Teltonika
Model	RUT9 Series
Category	Network Router
Language	English