Watlow 12LS Controller - Manual (Page 101)

7-3
If ANASOFT runs then the next step is to establish communications with the 12LS. On start up
ANASOFT checks communication with the controller. If the 12LS does not answer, a
communications error message will appear on the display.
7.2.5 Communications Problems
If the computer is functioning properly then the communication interface, cables and connections
must be checked. A number of problems have been traced to bad cables or connections.
7.2.6 Serial Interface
The serial interface must be correctly installed in the computer and set according to the
manufacturers directions. ANASOFT communicates using Comm Port 1. Some multi-function
interface cards allow setting of the comm port this should be done correctly. In addition be careful
that only one communications channel is set as comm port 1. If necessary the communications
port can be changed in the install program.
When the communications interface is correctly installed a scope can be used to check the transmit
line to insure characters are being sent to the 12LS.