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# What is the Multi-Port (RS-232 Sharing) Feature?

This connection mode allows multiple DataMan readers (of the same type) to share a single serial connection on a PC or other device equipped with a serial port. A multi-port connection creates a daisy-chain of readers. Each reader receives serial data from the previous reader and transmits it to the next reader. When a reader transmits data, it is passed through each of the readers in the chain between it and the PC.

You must construct your own cable that meets the requirements of your system configuration. The cable must provide a DB-15 connector for each DataMan device and a DB-9 connector for the PC serial port. Each DB- 15 connector must provide Tx Data, Rx Data, Trigger (Input 0), ground, and DC power. The Tx Data and Rx Data pins on adjacent connectors must be connected to provide the multi-port connection.

You must connect each DataMan device to DataMan Setup Tool using a USB connection and set the DataMan for multiport operation. To configure a device for multi-port operation, click on the Enable Multi-Port (RS-232 Sharing) check box.

For more detailed information on Multi-Port, consult the Multi-Port Connections chapter in the appropriate Reference Manual. The Multi-Port sharing feature has the following behaviors and limitations:

- Each reader in the chain can still be connected to the PC or other device through a USB connection.

- Each reader in the chain must receive its own trigger signal. The DataMan does not support serial triggering.

- Each reader in the chain must be configured separately.

- All data from each reader arrives unsorted and unfiltered to the PC or other device.

Note: DM150, DM260, DM050, DM060, DM070, DM300, DM360, DM370, DM470, DM580, DM380, DM503