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November 2001
Terminating Resistor
To eliminate noise on the transmission lines a terminating resistor may need to be used. If needed the
termination resistor need only be added to the last (furthest from the converter box) PCL501 in the network.
A termination resistor with a value of 120 ohms is needed in certain conditions; when using a 4000 ft. or
longer cable and a baud rate of 38400 or when using a 2000 ft. or longer cable and a baud rate of 57600.
If you need to add a terminating resistor, contact the factory for the exact location on the board.
Interfacing With A Driver
The PCL501(PC) was designed to control a step motor driver. For drivers with opto-isolated inputs, the
PCL501(PC) needs to sink current through the driver’s input LED. To do this, connect the +5VDC to the
positive terminals of the inputs and connect the clock and direction outputs of the PCL501(PC) to the nega-
tive terminals of the corresponding inputs on the driver. For the ON/OFF input, one of the PCL501(PC)
outputs can control this function. For a driver with TTL/CMOS inputs the PCL501(PC) has a negative
going clock and will sink the current from the driver’s inputs. Wire the clock and direction outputs and
0VDC reference of the PCL501(PC) to the clock and direction inputs and 0VDC reference of the driver
respectively. Once again an output of the PCL501(PC) can be used to control the ON/OFF function of
the driver. For a PCL501(PC) bought with an integrated driver and power supply, these connections are
already internally made.
Status LED
When powered and operated properly, the status LED will be green. When an error occurs, the LED will
change to RED and an error code will be generated in the error code register. To read and clear the error
with the software, click on the “Verify Parameters” button located in the “Motion Tab”. To read and clear
the error while in “Direct Mode” use the ! command. Once the error has been read and cleared, the LED
will return to green and the error code register will be cleared. Refer to the table on page 30 for a list of
the error codes.
July 2018
L010121