Watlow CPC400 - Manual (Page 167)

CPC400 Series User’s Guide Chapter 6: Troubleshooting and Reconfiguring
Doc. 0600-2900-2000 Watlow Anafaze 153
• Controller Address: Configure software to look for
the controller at the correct address. In a multiple-con-
troller installation, each controller must have a
unique address.
• Baud Rate: Software and controller must be set the
same.
• Parity: In the Modbus RTU protocol, the parity may
be set to none, even or odd. For error-free communica-
tions to occur, the CPC400 and any other device must
have the same parity setting.
• Hardware Protocol: PC and controller must use the
same protocol, or a converter must be used. The con-
troller is typically configured for EIA/TIA-232 when it
is shipped. See Changing the Hardware Communica-
tions Protocol on page 157 to change between EIA/TIA-
232 and EIA/TIA-485. To communicate with more
than one controller, or when more than 50 feet of cable
is required, use EIA/TIA-485. Even for a single con-
troller, you may use EIA/TIA-485 and an optically iso-
lating converter to eliminate ground loops.
• Converter: Make sure that the 232-to-485 converter
is powered, configured and wired correctly.
• Cables: Check continuity by placing a resistor across
each pair of wires and measuring the resistance with
an ohmmeter at the other end.
Software Problems
If the controller and serial communications connections
seem to be working correctly, but you are still not getting
the result you expect, consult the documentation for the
software program you are using.
Anafaze WatView and LogicPro software come with con-
text-sensitive help explaining operation of the software.
You can press the F1 key to get information related to the
part of the program you are using.
Clearing the RAM
Clearing the random access memory (RAM) returns all con-
troller settings to their defaults. All stored jobs are also
cleared from controller memory.
To clear the RAM:
1. Make a record of all controller settings.
2. Switch off power to the controller.
3. Press and hold <.
4. Switch on power to the controller while still holding <.
5. When you see the prompt Clear RAM?, release < and
press ..