These general instructions and practices are referencing the Metrologic Stratos Series integrated in counter scanner scales. Other scanner / scales are supported that use dual cables and NCI ECR scale protocols. Plexis POS supports many Stand Alone and Integrated Weight Scales connected to an RS232C Serial Port. Use a true RS232C Serial Port Adapter. Many Consumer based home computers that customers try to use in a business environment do not come standard with genuine RS232C serial ports. USB serial ports are not true RS232C. USB to Serial Port converters tend to truncate data depending on the driver and chip set. If you use a USB to Serial converter make sure that it supports true RS232C standards, otherwise the weight scale may not work properly.