National Instruments ENET-232 Series User Manual

Also see for ENET-232 Series: Manual

Contents

National Instruments ENET-232 Series User Manual Manual pdf 44 page image

Chapter 6 Using Your Serial Device Server© National Instruments Corporation 6-3 ENET-232 and ENET-485 Series User Manualtable. Alternately, you can use NI Ethernet device configuration todetermine the hostname associated with your assigned IP address, andchange the hostname to match the DNS entry. Refer to the Verifying theHostname section in Chapter 3, Ethernet Configuration, for moreinformation.Because there are many other possible reasons for failure, contact yournetwork administrator if you are having problems getting DHCP to work.When you can use DHCP and DNS successfully, you can use the hostnameform of the IP address to communicate with your product—even if thenumerical IP address changes with successive reboots.If you are setting up a small network for your instrumentation system,National Instruments recommends using static IP addresses, because theyare easier to implement and maintain. In this system, you can safely use thenumerical form of the IP address to communicate with your productbecause the address is unlikely to change. Small networks are less likely tohave domain name services available that would resolve the hostname intoa numerical IP address.Using the CFG RESET SwitchThe Configuration Reset (CFG RESET) switch is a recessed switch besidethe Ethernet (ENET) connector on the rear panel. Refer to Figure 2-2, RearPanel of a Four-Port Serial Device Server, for an illustration of its location.This switch performs two functions, depending on whether you press it atpower-on or during operation.Using the CFG RESET Switch During OperationWhile the serial device server is operational, as indicated by a steadyyellow PWR/RDY LED, you can use the CFG RESET switch to place thebox into network configuration mode.This special mode ensures that network parameters are not changed whilein normal operation mode. Because you cannot change the networkparameters unless you deliberately place the serial device server intonetwork configuration mode, the parameters are protected while in normaloperation. Hosts cannot connect to the serial device server while it is innetwork configuration mode.Note Pressing the CFG RESET switch has no effect if hosts are currently connected.