Installation
Dip Switch Function Descriptions
Baud rate switches
Switches 1, 2 and 3 of the eight position DIP switch are used to match the baud rate of the drive to the baud rate of the programming device. If the two baud rates are not the same, serial communication will not be possible.
Axis identifier switches
Switches 4, 5, 6, 7 and 8 are used to distinguish between drives in a
Duplex switch
Switch 1 of the four position DIP switch sets either half or full duplex mode. In half duplex mode the serial data is not echoed back to the programming device for conformation or display. In full duplex mode the data is echoed back to the programming device, allowing the data to be verified. In most cases full duplex is the preferred mode of operation.
NOTE: All drives in a
Auto line feed
Switch 2 is used to determine if a line feed character should be echoed back to the programming device when a carriage return is received. This will alter the line spacing on the programming monitor.
Framing information
When using serial communication, the data must be sent as a string of continuous bits. This string of data bits must be "framed" by start and stop bits so that valid data can be recognized. The framework which the drive will recognize is as follows:
1 start bit
8 data bits
1 stop bit
The high order data bit is ignored by the drive. A parity bit may therefore be sent to the drive along with only seven data bits. When transmitting, the drive will always send a zero for the eighth data bit.
Serial Cables
The maximum allowable length of serial cable used with the 525 PMC is 50 feet. This limitation is a result of the following statement from the EIA
"The use of short cables (each less than approximately 50 feet or 15 meters) is recommended; however, longer cables are permissible, provided that the resulting load capacitance measured at the interface point and including the signal terminator, does not exceed 2500 picofarads".
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