OM-WEB-TC 美国OMEGA OM-WEB-TC 记录仪

　　the om-web-tc is a thermocouple measurement device with built-in web server. simply connect the device to an ethernet port or hub and view current data using a standard web browser. the om-web-tc’s embedded web interface provides access to current data and configuration settings using a standard web browser. browse to the device’s home page by entering the url that is printed on the device into the browser. view current thermocouple measurements and channel data, and configure hardware options from the device’s home page. only one user can change configuration options on the device at a time. the web interface is built into the device’s firmware, and does not need to be installed on a computer. no external software is required other than a web browser and a tcp/ip connection. connect the device’s 10base-t ethernet port to a local or wide area network using the supplied ethernet cable, to a single computer through a hub using the supplied ethernet cable, or directly to a computer using a standard cat-5 crossover cable. the web browser used to access the om-web-tc’s web interface must support java.

　　the om-web-tc provides 8 thermocouple channels and 8 digital i/o channels. the included external power supply (ac adaptor) is used to provide power. on-board leds display the status of communications and external power. all hardware configurable options are selectable with the web browser or the included instacal utility software. network configurable options are settable using instacal. when using instacal, if the login settings have been changed from the default, a login name and password are required to change the configuration settings. the om-web-tc provides 8 differential thermocouple input channels. a 24-bit analog-to-digital (a/d) converter is provided for each pair of analog inputs. thermocouple types j, k, t, e, n, r, s, b are supported. the thermocouple type is software programmable for each channel. four cold junction compensation (cjc) sensors are provided for thermocouple measurements. each cjc sensor is dedicated to two thermocouple input channels. an open thermocouple detection feature lets you detect a broken thermocouple. an on-board microprocessor automatically linearizes the measurement data.

　　the om-web-tc features 8 independent temperature alarms, each alarm controls an associated digital i/o channel as an alarm output. the input to each alarm is one of the temperature input channels, the output of each alarm is software configurable as an active high or low. the user configurable threshold conditions activate each alarm. when an alarm is activated, the associated dio channel is driven to the active output state selected. eight digital i/o channels are provided to communicate with external devices and to generate alarms. the digital bits are software programmable for input or output. the digital output voltage is switchselectable for 3.3v or 5v logic. a screw terminal is provided for pull-up or pull-down configuration. the om-web-tc web interface displays current data read from the device and does not log or store historical data. use the included tracerdaq software to log or graphically trend your data. the om-web-tc module ships with an impressive array of software, including the new tracerdaq?, a full-featured, out-of-the-box data logging, viewing, and analysis application; universal library?; ulx for ni labview (comprehensive library of vis and example programs compatible with 32- and 64-bit labview v8.5 through 2011) and instacal? installation, calibration, and test utility–powerful software solutions for programmers and nonprogrammers alike. these modules operate under microsoft windows xp/vista/7 (32-bit and 64-bit) operating systems.

　　specifications

　　analog inputs

　　a/d converter: 4 dual 24-bit sigma delta a/d converters

　　input isolation: 500 vdc min between field wiring and usb interface

　　number of channels: 8 differential temperature inputs

　　differential input voltage range: ±0.080v

　　absolute maximum input voltage: ±25v (power on), ±40v (power off)

　　throughput rate: 2 samples/sec max for all active channels

　　input impedance: 5 gω min

　　input leakage current: 105 na max (with open thermocouple detection enabled)

　　normal mode rejection ratio: 90 db min

　　common mode rejection ratio: 100 db min

　　warm-up time: 30 minutes max

　　open thermocouple detection: 3 sec open detection time (max)

　　cjc sensor accuracy: -0.75 to 0.5°c max (15 to 35°c);

　　-1.5 to 1.25°c max (0 to 55°c)

　　digital i/o

　　number of digital i/o channels: 8

　　type: cmos

　　configuration: each dio bit can be independently configured for input or output.

　　switch selectable output voltages of 5v or 3.3v.

　　power on reset is input mode unless bit is configured for alarm

　　pull-up/pull-down configuration: all pins are connected to 47 ω resistors

　　(user configurable for pull-up mode to 5v or pulldown mode).

　　digital i/o transfer rate (software paced):

　　digital input: 50 port reads or single bit reads per second (typical)

　　digital output: 100 port writes or single bit writes per second (typical)

　　input high voltage: 4.0v min, 5.5v absolute max (5v mode);

　　2.64v min, 5.5v absolute max (3.3v mode)

　　input low voltage: 1.0v max, -0.3v absolute min (5v mode);

　　0.66v max, -0.3v absolute min (3.3v mode)

　　output high voltage: 4.3v min (5v mode),

　　2.7v min (3.3v mode); ioh = -2.5 ma

　　output low voltage: 0.6v max (iol = 2.5 ma)

　　temperature alarms: 8 (one per digital i/o line)

　　network

　　ethernet compliance

　　device type: ieee 802.3 ethernet 10base-t

　　device compatibility: ieee 802.3-2003 10 mpbs media access control

　　ethernet connection

　　ethernet type: 10base-t

　　connector: rj-45, 8 position

　　cable: cat-5 shielded, unshielded twisted pair

　　length: 100 m (328') max

　　mac address: 00:12:71:cx:xx:xx where xxxxx is the device's serial number

　　network factory default settings

　　ip address: 192.168.0.101

　　subnet mask: 255.255.255.0

　　gateway: 192.168.0.1

　　dhcp setting: enabled

　　user name: "webtc"

　　password: "omega"

　　web server: enabled

　　network protocols

　　protocols implemented: ip, arp, icmp, dhcp, udp, tcp, nbns, http

　　udp messaging protocol: udp port 54211

　　tcp downloading protocol: tcp port 54267

　　http 1.0 alternate port: tcp port 49152-65535 (not including 54267)

　　network name: "webtc_xxxxx", where xxxxx is the device's serial number

　　max number of simultaneous http connections: 3

　　max number of non-http tcp sockets: 5

　　network security

　　security implementation: ip address based session manager with username/password

　　session timeout: 5 min with no activity

　　username/password encryption: base64 (the default web page does not support

　　encryption if java is disabled in the web browser)

　　vulnerabilities: denial of service attacks, username/password spoofing,

　　probing and simple decryption

　　general

　　memory: eeprom (512 bytes for sensor configuration);

　　flash (2 mb for device configuration and website storage)

　　microcontroller: one high-performance 8-bit risc microcontroller and one high-performance 16-bit risc microcontroller

　　power supply voltage (supplied by included external power supply): 5 vdc ±5%

　　power supply current (supplied by included external power supply): 440 ma max

　　user output voltage (5v): 4.65v min to 5.25v max

　　dimensions: 127

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