http://www.cadfamily.com/downinfo/300507.html
The VersaMax Micro and Nano havevarious communications options to meetyour control needs. Each unit has an RS-232 port that can be used for SNPSlave, Modbus RTU Slave or Serial In/Oucommands. The second port on the 23point and 28 point micro is an RS-485port that supports SNP Slave, SNPMaster, Modbus RTU Slave and SerialIn/Out commands. Modems can easily be attached to either port. With the Serial I/O commands you can interface to devices such as pagers, intelligentscales, bar code readers and printers.
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