Series 3700A System Switch/Multimeter Reference Manual Section 2: Installation3700AS-901-01 Rev. D/June 2018 2-25Addressing instruments with VISAVISA allows you to communicate with the instrument on different communication buses by changing aresource string that gets passed in with the viOpen function, in VISA-C, or with the Open method onthe VISA-COM resource manager object.For detailed information about the format of the resource string, refer to the VISA specificationVPP4.3 at the IVI Foundation website, or refer to the help file provided by the vendor of the VISAimplementation you are using.The following sections describe the resource strings for some of the communication types thatKeithley supports. Any field that has [] (square brackets) around it is optional and will revert to adefault value.Addressing instruments through the LANVISA supports two different LAN protocols, each of which has a different resource string.VXI-11 is a protocol that emulates GPIB over the LAN. Series 3700A supports this protocol. Theresource string is:TCPIP[board]::host address[::LAN device name][::INSTR]board is the network interface card in the computer. This value is usually skipped and VISAdetermines the correct network interface card (if you have more than one) by looking at the IPaddress.host address can be either a valid DNS hostname, mDNS hostname, or the IPv4 IP (only) addressof the instrument.LAN device name is a method of addressing secondary instruments at the main IP address, similarto secondary addressing on the GPIB bus. The default is inst0.A raw socket connection requires more work by the driver or application program to make sure thecorrect amount of data has been sent or received correctly. All Keithley instruments support the rawsocket connection.TCPIP[board]::host address::port::SOCKETThe board and the host address are the same as for the VXI-11 protocol.port is the port to which to connect on the instrument. For the Series 3700A, the port is 5025.Addressing instruments using USBUSB[board]::manufacturer ID::model code::serial number[::USB interfacenumber][::INSTR]board is not used (0).manufacturer ID is the USB.org reserved four-digit hexadecimal code for the instrument vendorcompany. Keithley Instruments hexadecimal code is 0X5E6.model code is the model number of the instrument. For example, when addressing a Model 3706A,use 0X3706.serial number is the serial number of the instrument.USB interface number identifies which USBTMC interface on the instrument to address(usually 0).
