10 USB Interface
10.1 Device Interface
The USB device interface allows the indicator to be connected to a host PC as a slave device. The indicator
will appear as a virtual serial port device to the PC. This requires a Windows driver to be installed which is
supplied with the C500 viewer software. Windows versions 7, 8.1 and 10 are supported.
Once the drivers have been installed on the host PC, the serial port can be accessed in the same manner as a
traditional PC serial port. This port is referred to as SER.SLV within the indicator.
10.2 Host Interface
The USB host interface allows slave devices to be connected to the indicator.
Warning!
Due to hardware limitations it is only possible to reliably connect one USB slave
device to the USB host port.
Supported devices include:
Keyboard: Connecting a keyboard will permit operation of the indicator via the keyboard. Keys are
mapped as shown in the table below. The CTRL key in combination with F1-F6 will emulate a long
press.
USB Keyboard C500 Front Keys
F1 Zero
F2 Tare
F3 Gross/Net
F4 F1
F5 F2
F6 F3
USB Mass Storage Device: Connecting a USB mass storage device will permit reading and writing files
to the mass storage device. Firmware can be updated from an update file stored on a USB disk. Settings,
DSD and changelog contents can be written to a USB disk. These settings are accessed via the FILE menu
in safe and full setup menu (see Section 5.12). When a USB disk is connected, “USB.DSK ADDED” will
appear on the display after a 5 second delay. If a USB disk is connected while the menus are active, this
message will not be displayed until exiting the menus.
Note
Only FAT32 files systems are supported.
Warning!
It is recommended that an attached USB disk is ejected before removal to
ensure all files have been written to the disk. See FILE:EJECT in the setup
menus (Section 5.12).
USB Printing: A text based USB printer can be connected to the indicator for printing. An example of
a text based USB printer is the Custom Q1 printer (http://www.custom.it).
USB Serial Ports: A USB serial port may be connected to provide the serial communication functions
listed in SERIAL:SER.HST:TYPE (see Section 5.5). Supported chipsets include FTDI FT232R, Prolific
PL2303 and Silicon Labs CP210x.
55 C500-600-2.0.3
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