206 43-TV-25-30 Iss.6 GLO Aug 07 UK
Front and Rear USB Communication Ports
USB communication ports can be found one at the front and one at the rear of the recorder.
The eZtrend QXe only has one USB port at the front fitted as standard. An extra rear USB
port is only available with the Comms card option.
The USB Host ports will provide an interface for:
• Save and Load Data.
• Save and Load Setups.
• External keyboard & mouse
• Barcode reader
• Mass storage device (USB key) or Hard drives (250 GB)
USB Barcode Reader
USB ports allow the use of a USB barcode reader.
Protocols
Protocols are an agreed-upon format for transmitting data between two devices. The pro-
tocol determines the following:
• the type of error checking to be used
• data compression method, if any
• how the sending device will indicate that it has finished sending a message
• how the receiving device will indicate that it has received a message
The following Protocols available are:
Modbus
Modbus primarily sends data, no setup information is transferred via Ethernet or RS485
ports. The device ID and Serial number is held in the setup and this information is required
to locate the correct device in TrendServer.
Modbus only requires the correct Slave ID to connect, see “Modbus” on page 77. If the
device is detected using the Slave ID the Recorder ID and Serial Number will be transferred,
if the device is not detected an extra device will appear in the database containing the Re-
altime data.
Depending on the type of network being used, it maybe advisable not to use Modbus comms
and FTP in the same time to the same PC. This may cause the FTP transfer to time-out.
Only data can be sent via Modbus. No recorder setups or events are sent for realtime and
logged data.
However, a Modbus interface, such as Modscan 32, can be set up as Modbus master and
used to transmit Totals, Digital Input, Digital Output, a Comms Variable (CV) or Messages
to the recorder.
Modbus X
Modbus X protocol differs from standard Modbus by the reversed byte order of the floating
point number. The Comms Server provides an integrated facility for testing a device to help
decide which modbus protocol variant to use. See “Edit a Device” on page 223. Modbus
Mapping and Function Codes, see “Appendix J: Function Codes and Memory Maps”
on page 303
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