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The Laureate WiFi, USB and RS485 communication board P/N LWIFI485 allows a Laureate 1/8 DIN digital panel meter, counter or timer to be interfaced to an external PC or HMI via WiFi, USB or RS485. The use of WiFi, which is standard with most computers, avoids the need for communication cables. It also allows much higher data and polling rates than Laurel's first-generation communication boards.
WiFi operation complies with the IEEE 802.11 b/g/n wireless standard for data rates up to 72.2 Mbits/sec. The board can be polled every 10 msec using Modbus TCP commands as document in our Gen 2 Communications Boards user manual. Analog readings retrieved via WiFi can be updated 50 or 60 times per second, depending on the meter's 50 Hz or 60 Hz AC line noise rejection setting.
Cached operation is a key feature of the LWIFI board. That board polls its host meter at the maximum rate allowed by the meter's main board, such as 60 analog readings per second, and it can in turn be polled asynchronously as a Modbus slave at a much faster rate using WiFi, USB or RS485.
An on-board 2.4 GHz antenna simplifies meter installation, but requires that the meter be installed on a benchtop or in a plastic case that is transparent to radio waves, like our BOX1 or BOX2 benchtop cases. The on-board antenna has about 10 dB less gain than the external antenna that comes with the LWIFIX WiFi board.
A mini-USB connector is standard and can be used for meter programming or for data polling as a Modbus slave at 38400 baud in parallel with polling via WiFi. To connect to the USB port of a PC, use our cable CBL07 or another readily available A-male to Mini-B USB cable.
An RJ11 connector is standard for RS485 and can be used for data polling as a Modbus slave at up to 115200 baud or for operation as a Modbus master at 19200 baud to an RS485 bus with up to 31 adressable Laureate meters or LT series transmitters. Meters on the RS485 bus can be daisy chained using our CBL03 data cables. LT transmitters can be added using our BKBD breakout board.
Setup of WiFi, USB and RS485 communications uses our free Laurel Network Setup (LNS) utility. That software allows users to enter the WiFi system's SSID and password, which is then be stored in the WiFi board. It automatically discovers the board's IP address assigned by the WiFi router, the COM port used for USB communications, the meter type, and the signal conditioner type. LWIFI board setup and available Modbus commands are documented in our Gen 2 Communications Boards user manual. The USB or RS485 ports can also be used with our free Instrument Setup (IS) software to set up the host instrument and remote instruments on an attached RS485 bus,
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| WiFi Operation | |
|---|---|
| WiFi application | Connection to a Modbus master via a wireless router |
| Wireless LAN standard | IEEE 802.11 b/g/n |
| Radio frequency | 2.4 GHz license-free ISM band |
| Maximum data rate | 72.2 Mbits/sec, MCS index 7, with 802.11 n |
| WiFi module | ATWINC1510-MR210PB (with integral antenna) |
| WiFi interface | 2.4 GHz printed antenna |
| Maximum radio range | 90 m (300 ft) unobstructed outdoors |
| USB Operation | |
| USB applications | Laurel Network Setup, host meter programming, operation of host meter as a Modbus slave. |
| USB connector | Mini-USB Type B jack |
| USB cable | Mini-USB Type B to USB Type A (CBL07) |
| USB data rate | 38400 baud |
| COM port | Discovered by Laurel Network Setup (LNS) utility |
| RS485 Operation | |
| RS485 applications | Laurel Network Setup in lieu of USB, host meter programming, operation of host meter as a Modbus slave, or operation as a gateway to an RS485 bus with up to 31 meters or transmitters. |
| RS485 connector | RJ11 jack |
| RS485 cables | CBL06 adapter cable to PC USB port, CBL03 to daisy chain meters on RS485 bus. |
| RS485 data rate | 1200 to 115200 baud as a Modbus slave, 19200 baud as a Modbus RS485 master. |
| COM port | Discovered by Laurel Network Setup (LNS) utility |
| Cache Operation | |
| Data written into cache | Display value only or set of 6 values (user selectable) |
| 6 values for analog in DPMs | Alarm status, display value, peak, valley, display value, display value |
| 6 values for scale meters | Alarm status, display value, peak, net weight, gross weight, display value |
| 6 values for counters | Alarm status, item 1 (display value), peak, valley, item 2, item 3 |
| Write interval for 1 value | 16.666 mecs or 20.000 msec (filtering set for 60 Hz or 50 Hz noise rejection) |
| Write interval for 6 values | 100 msec or 120 msec (filtering set for 60 Hz or 50 Hz noise rejection) |
| Read inteval from cache | Set by external Modbus Master, 10 msec minimum |
| Measurement Update Intervals | |
| Analog input meter | 16.666 msec or 20.000 msec (filtering set for 60 Hz or 50 Hz noise rejection) |
| Totalized pulse readings | Signal period or gate time from 10 msec to 199.99 sec |
| Frequency/rate readings | Gate time + 30 msec + 1-2 signal periods |
| Communication Protocols | |
| Data I/O via WiFi | Modbus TCP/IP (same command set as Modbus RTU) |
| Data I/O via USB or RS45 | Modbus RTU |
| Meter programming | Front panel keypad or Instrument Setup (IS) software |
| Mechanical | |
| Board dimensions | 79 x 39 mm |
| Mounting location | Middle sloft of Laureate Series 2 panel meter or counter |
| Environmental | |
| Operating temperature | -40°C to 85°C |
| Relative humidity | 95% from 0°C to 85°C, non-condensing |
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