West Control Solutions CALogix - Manual (Page 12)

For multiple instrument networks each transmission line must be properly terminated to prevent reflections. 120 Ω
termination resistors should be fitted between TX+ & TX- and RX+ & RX- at the connection to the PC in addition to the last
instrument in the chain. See example below.
When transmission lines are not transmitting, they remain in an intermediate state which can allow receivers to receive
invalid data bits due to electrical noise on the cable. To prevent this bias resistors may be required to force the lines into a
known state. Some RS485 interface cards and converters may have bias resistors fitted please check manufacturer’s
specification and recommendations for use of bias resistors.
Note:
The default Modbus address for each base-unit is 1, for a network with a number of CALogix units, power-up each
unit individually and configure them with a unique Modbus address using CALogix-sw configuration tool. (See section on
base-unit set-up in manual)
CALOGIX-SW MINIMUM PC SYSTEM REQUIREMENTS
As a general requirement, we would recommend a minimum of Pentium 450MHz with 256MB RAM, Windows
TM 2000/XP
and screen resolution, 1024 x 768.
INSTALLING CALOGIX-SW
1. Insert CALogix-sw disk into CD-drive.
2. CALogix-sw install program should auto-run. If this does not happen, manually run ‘setup.exe’ on CALogix-sw
cd.
3. Follow on screen instructions to complete installation.
RUNNING CALOGIX-SW
1. Click ‘start’ on Windows toolbar.
2. Mouse-over ‘all programs’.
3. Mouse-over ‘CALogix folder’ in menu.
Page 12 of 44