Rs232 Character Set; Usb Interface; Lan Interface - Metek Sorensen XEL serie Manual De Operación

Baud Rate for this instrument is fixed at 9600; the other parameters are fixed as follows:
Start Bits: 1
Data Bits: 8

RS232 Character Set

Because of the need for XON/XOFF handshake it is possible to send ASCII coded data only; binary
blocks are not allowed. Bit 7 of ASCII codes is ignored, i.e. assumed to be low. No distinction is
made between upper and lower case characters in command mnemonics and they may be freely
mixed. The ASCII codes below 20H (space) are not used. In this manual 20H, etc. means 20 in
hexadecimal. The unit will send XOFF when there are 50 free bytes remaining and XON when this
increases to 100 bytes.

USB Interface

The USB interface is a virtual COM port which can be controlled by a PC as if it was a RS232
device. The instrument is supplied with a CD containing an .inf file for the standard Microsoft drivers
available in Windows 2000, XP, Vista and Windows 7; the installation wizard will install the driver
(32-bit or 64-bit) appropriate to the PC's operating system.
Installation of the interface driver is achieved by connecting the instrument to a PC via a standard
USB cable. The Windows' plug and play functions should automatically recognize the addition of
new hardware attached to the USB interface and, if this is the first time the connection has been
made, prompt for the location of a suitable driver. Provided that the standard Windows prompts are
followed correctly Windows will install the appropriate driver and establish a virtual COM port within
the PC. The number of the new COM port will depend upon the number of co-existing COM ports
within the PC. The virtual COM port can be driven by Windows applications in exactly the same way
as a standard COM port, except that the Baud rate setting of the virtual COM port is ignored.
The driver will remain installed on the PC so that the establishment of a virtual COM port is done
automatically each time the instrument is connected to the PC via USB in the future.
Further virtual COM ports are created for each additional instrument connected to the PC via USB.
Each instrument is assigned a separate virtual COM port when it is first connected and the same
COM port will be assigned each time that instrument is subsequently connected; the PC software
makes use of the unique code embedded in each instrument to link it to the same virtual COM port
irrespective of which physical USB port it is connected to.
Use can also be made of the ADDRESS? command to easily identify which instrument is being
controlled by a particular COM port. Although the addressing capability is ignored in USB operation
the address can still be set and used as an identifier; set each USB-connected instrument to a
different address and send the ADDRESS? command from each virtual COM port to confirm which
instrument is connected to that port.

LAN Interface

The LAN interface is designed to comply with the LXI standard version 1.2 and contains the
interfaces and protocols described below. Since it is possible to misconfigure the LAN interface,
making it impossible to communicate with the instrument over LAN, a LAN Configuration Initialize
(LCI) mechanism is provided via a recessed switch on the rear panel to reset the unit to the factory
default. The default setting is for the instrument to attempt to obtain settings via DHCP if available
or, if DHCP times out (30 seconds), via Auto-IP. In the very unlikely event that an Auto-IP address
cannot be found a static IP address of 192.168.0.100 is assigned. Resetting the LAN removes any
password protection.
For more information on LXI standards refer to www.lxistandard.org/home .
24
Parity: None
Stop Bits: 1