Specifications

HYDROLOGICAL SERVICES
DL3 100-08 IMP
Issue 2: 15/11/2005
Black Connector Pin B
4-20mA Sense
Black Connector Pin A
Switched +12V
RRDL-3 Logger
Black Connector Pin C
Sensor 0v
12V Battery
+
Sensor 0v
Switched +12V
4-20mA Transducer
4-20mA Sense
Black Connector Pin E
Black Connector Pin D
Red Connector Pin B
Rx Da ta
Red Connector Pin A
Tx Dat a
RRDL-3 Logger
Red Connector Pin E
Gnd
P
C
DB9
DB25
3
3
2
5
2
7
Rx D
TxD
Gnd
Connection of 4-20mA River Transducer with Internal Smart Sensor
(MO=Off & Dip Sw On)
* Pinc C not used for 2-wire systems
3.1.3 Communications
The 7 pin connector with the red marking on the logger is the communications port and is setup as
follows:-
Pin Connection Signal Name
A Tx Data (Output from logger)
B Rx Data (Input to logger)
C Carrier Detect (Input to logger)
D Not Connected
E Not Connected
F Modem Power (Not Implemented)
HGnd
Direct connection to a PC (Handshake = Xon/Xoff)