Teltonika RUT955 User Manual page 125

RUT955 User's Manual
9.6.1.1 RS232 connector pinout
RS232 connector type on this device is DCE female. DCE stands for Data Communication Equipment.
Pin Name*
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
*The names and descriptions that indicate signal direction (such as TXD, RXD, RTS, CTS, DTR, and DSR) are named from
the point of view of the DTE device.
9.6.1.2 Cables
RUT955 has a DCE female connector. To connect a standard DTE device to it, use a straight-through Female/Male
RS232 cable:
To connect another DCE device to RUT955, a Null-modem (crossed) Female/Female cable should be used:
Maximum cable length is 15 meters or the cable length equal to a capacitance of 2500·pF (for a 19200 baud rate).
Using lower capacitance cables can increase the distance. Reducing communication speed can also increace maximum
cable length.
Teltonika Solutions
Description*
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal Ground
Data Set Ready
Ready To Send
Clear to send
Ring indicator
Direction on this device
Output
Output
Input
Input
-
Output
Input
Output
Output (connected to +5V permanently via a 4.7k resistor)
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