Watlow Electric Revision 5 - Manual (Page 71)

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Verify that you are using the COM 1 serial port on your computer. Anasoft
assumes this to be the active communications port.
Verify the wiring connections between your computer and the Anafaze
controller. For RS-232, only three wires are (Rx, Tx and Gnd) are necessary
to communicate with the controller.
Check the hardware communications option that was specified when you
ordered your controller. If your processor module was modified for current-
loop operation, it will not interface with a RS-232 circuit directly.
If all these items are checked and OK, contact ANAFAZE, the
PROCESSOR I/O MODULE probably has a problem.
11.4.5 No Control Outputs from PIOM
The Anasoft operating program displays proper output values for each loop
but the controller outputs remain off (0%).
Verify that the OUTPUTS ON input on the processor module is enabled. A
low level (0 volts) signal is necessary at this terminal to enable operation of
controller outputs. This connection is made at TB2, pin 35. NOTE: This
may be accomplished by connecting a jumper on TB2, between pin 32
(GND) and TB2, pin 35.
Chech the action of the communications watchdog timer. This may be
enabled and will set all control outputs to manual with zero output if
communications is not maintained by the host computer. Please see section
3.3.2 for details.
11.4.6 Measured Data Errors
If the input data does not appear to be correct or remains constant, check the
indicator lights on the analog input boards (RRAIM or SSAIM). The green
light indicates that the isolated supply is working properly, and a flashing
orange light indicates that the input module is scanning.
If the green light is not on and the PIOM has passed all the previous
conditions, then the most likely fault is in the input module. If the green
light is on and the orange light is not flashing, then the problem is probably
in the PIOM but could be in the input module. If the green light is on and
the orange light is flashing, then the problem is probably the input module,
the system wiring, or the transducers.