Emerson 400276-01 operation manual Serial Interface, Serial a, Serial B, Multi-Drop Configuration

525 Programmable Motion Controller

NOTE: Both the hardware and software position travel limits are active if they are set up.

The "STOP" I/O function must be held "Active" to prevent motion. if the "Stop" I/O function is not held "Active", the operator must stop incoming command voltage to avoid motion. Failure to follow proper safety procedures can cause death or serious injury.

Serial Interface

All 525 PMC's are equipped with two RS423 serial interface connectors which are RS232C/RS422 signal compatible. The serial interface has a DIP switch selectable baud rate ranging from 110 to 19200 bps and is connected using a simple three wire hook-up; transmit, receive and signal ground. Transmission is accomplished using standard printable ASCII characters. This means that the 525 PMC can also communicate over the serial interface with a remote terminal.

Serial A

All programming is done through the "Serial A" connector. The serial cable should be shorter than 50ft in order to comply with RS232 specifications. However, longer cable lengths can be possible at slower baud rates. (Less than 4800 bps).

Serial B

The 525 PMC also includes a second 9 pin RS423 serial connector designated as "Serial B", which is used for a multi-drop networking scheme to other drives. This second connector cannot be used for programming other than in a multi-drop set up.

Multi-Drop Configuration

When using multi-drop configuration, the 525 PMC can automatically detect when there are other units "down the line" and redirect its serial signals to the appropriate drives or 525's. The serial commands are sent to the appropriate unit based on the axis identifier dip switch settings. Each 525 PMC in a multi-drop configuration must have a unique axis identifier code and must be set up for full duplex mode.

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