QDR
– QTech Digital Radio – Owner’s Manual – v1.4 – October 2014
www.qtech.co.nz
Page 7 of 16
5.0 Applications
5.1 RS232 Mode
This is used for serial data communications.
A typical use of this mode would be:
The serial cable is connected from the RS232 port of the QDR to an RS232 port of
the RTU.
Pinout of RS232 Port and interface cable connections.
D9 Pin
Signal
Input/Output
Description
RJ45
Pin
1
DCD
Output
Data Carrier Detect
2
RxD
Output
Receive Data
2
3
TxD
Input
Transmit Data
6
4
DTR
Input
Data Terminal
Ready
5
GND
-
Ground
5
6
-
-
Not Connected
7
RTS
Input
Request To Send
8
CTS
Output
Clear To Send
9
RI
Input
Ring Indication
Please note: For non-standard installations please contact QTech for advice as
there can be variations in the pinout configuration
.
5.2 RS485
– Half Duplex Mode
A typical use of this mode would be:
The serial cable is connected from the RS485 port of the QDR to the RS485/IPB port
of the RTU at a comms speed of 9600bps.
RS232
DATRAN Master RTU
Slave RTU
RS485-IPB
DATRAN RTU
Remote I/O
Q23 or Q26
