Specifications

HYDROLOGICAL SERVICES
DL312 100-03 IMP
Issue 2: 15/11/2005
1. Introduction
This software package has been specifically written to communicate to the Hydrological Services
Rain and River Data Logger RRDL-3. The program itself is a simple terminal emulation package
with simple to use configuration options that match the options selectable from the RRDL-3 Data
Logger. These options include computer COM port selection (COM1 or COM2), baud rate (300
or 1200 or 2400 or 9600), number of bit and parity (8/N/1 or 7/E/1) and handshake (None or
XON/XOFF or Hardware). The software also allows the saving of all communications within a
session to a user named file, for later examination. Note that this software is not tailored for
modem operation.
2. Hardware Connection
The RRDL-3 provides three forms of handshake “None”, “XON/XOFF” or “Hardware”.The
most common and widely used form of handshake is XON/XOFF. The Hardware handshake
requires one extra wire between the logger and the PC. Also note that PC’shavetwotypesof
physical connection to their serial port, a DB9 plug or a DB25 plug.
Direct connection to PC (Handshake = None or Xon/Xoff)