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Showing results for tags 'multiplexer'.
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Connecting multiple RS-232 devices to the same PLC
Walks posted a topic in Allen Bradley / Rockwell Automation
Does anyone have any experience with sending multiple RS-232 devices to the same PLC? My current set up has 2 RS-232 devices sending raw ASCII data to a 2-port Comtrol DeviceMaster EIP-2202 where it is then sent to the PLC via Ethernet/IP. The problem is that now I need to add three more RS-232 devices. Without buying more DeviceMasters, is there a way of adding the 3 extra devices to where the data from each device can be read separately? I know RS-232 is 1 to 1, but is it at all reliable to use a multiplexer? I've looked into and I think it MIGHT work, but I'm a little nervous about adding the extra complexity. Another option I was looking into was to somehow convert multiple RS-232 connections to a single RS-485, which from my understanding can support multiple command and listening devices and I would need to be able to address each different device. My comtrl supports RS-232/422/485. Thanks for any help! -
Hi All, how to do on a unit OD214 (16 OUT) "LOW" an "HIGH" byte? I need to multiplex address 0-255 (1/2 7 OUT) and send data (2/2 8-16 OUT) 0-255 OD214 ... Thank you George Walk