Transcript Technical Training

APM Automation Solutions Ltd.
Advanced Communication
Connections
Asael Sharabi, Technical Director
Agenda
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4-20mA / HART
RS485 / Modbus
GPRS / GSM / Smart GPRS
3DLinkPro / Modem Wizard
TCP/IP
Modbus
Barriers for explosive environment
Understanding Computers and Networking
– MAC address, IP, TCP, Ports, Routers, etc.
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Connection Methods
The 3DLevelScanner can be connected to different
systems for different purposes
• 4-20mA
– A method of level/volume indication to a PLC or DCS system
• HART
– Using existing 4-20mA connection to transfer more data and
allow a PC software to connect to a remote device
• RS485
– A serial, 2-wire, multidrop (“Daisy Chain”) communication
protocol, works in a mode of one master-many slaves, with
APM it is limited up to 64 scanners
• Modbus
– Type of communication that utilizes the RS485 physical
infrastructure
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Connection Methods (2)
• GSM (CSD)
– Using a RS485 GSM modem to connect and communicate
with another GSM modem in a different location
• GSM (GPRS)
– Using a RS485 GPRS compatible modem to convert the
serial data from the RS485 bus to an IP packet and transfer
it over the global Internet network
– The other party should also be connected to the Internet
• 3DLinkPro
– APM approved modem for both GSM and GPRS
• Modem Wizard
– Configuration application for the 3DLinkPro, used to test and
confirm the functionality of the modem and SIM card
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Connection Methods (3)
• TCP/IP
– Using a compatible RS485 to TCP/IP convertor,
the 3DLevelScanners can be connected to a local
area network and be monitored by any computer
connected to that network
• APM recommends the use of BF-430
manufactured by CHIYU
• Connecting the 3DLevelScanner requires
know-how and understanding of many terms
and how they integrate together
• Let’s Start…
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4-20mA
• The 3DLevelScanner output on an active 4-20mA
– The Volume in percentage as defined by the full and empty calibration
levels
• The 4-20mA requires connection of a passive device on the other
side for proper performance
• The 3DLevelScanner can be configured to output 4-20mA  0%-
100% or 20-4mA  0%-100%
• For testing purposes, the 3DLevelScanner can simulate any current
level between 4mA to 20mA in resolution of 0.01mA
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4-20mA+HART
• The 3DLevelScanner can
be controlled via the
3DLevel Manager using
the 4-20mA output
• A MicroLink HART
modem is recommended
for use with the
3DLevelScanner
• HART Baud rate is
1.2kbps
• Max cable distance: 3km
(2miles)
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Connection example of 47
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20mA + HART
Multiple Scanners Using 4-20ma Output
Only
Silo 1
Silo2
Silo3
Silo 4
Silo 5
Silo 6
Silo 7
Control Room
Paperless
Recorder
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RS485
• Serial communication method
– One device is a master, in this case the
3DLevelManager (or 3DVision)
– All other devices are listening and replying on demand
• Each node on the bus has a unique address (polling
address) between 00 to 63
• Masters can be connected on the RS485 bus using a
communication converter, such as GSM modem, TCP/IP
converter, USB, RS-232, etc.
• Cable requirements:
– Shielded, Twisted-pair, 120 Ohm impedance,
• Important: Daisy-Chain connection, 120 Ohm resistor and
shield grounded at both ends of the bus/line/cable
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RS485
• Resistors must be at the far ends of the RS485
bus
• When two or more power supplies are in use,
it is recommended to use mutual ground
• Cable grounding shield must be connected to
the ground on both sides of the cable
• Max Cable distance: <1000m (4000ft.)
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Daisy Chain connection up to 64 scanners
Scanner
1
Scanner
2
Scanner
3
RS485 (+)
Scanner
n
RS485 (-)
120 Ω
120 Ω
RS485 (-)
RS485 (+)
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GSM using 3DLinkPro
• Using two GSM modems to send and receive data
• On the scanner side the modem must be connected
to the RS485 bus
• On the computer side, the modem communication
port must be connected to the computer using
compatible converter
• The SIM cards on both GSM modems must be
enabled with data transfer capability from the cellular
provider, also referred to as CSD
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GSM Connection
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GPRS using 3DLinkPro
• Using 3DLinkPro to convert the RS485 data into TCP/IP
packet and transfer it over GSM network
• SIM card must be activated and compatible with GPRS,
and allow sending and receiving of SMS messages
• Recommended data quota/plan is at least 150MB/month in
constant connection
• Before using the 3DLinkPro it is advised to test the SIM
card with the 3DLinkPro in-house before shipping (using
the APM Modem Wizard)
– SIM #, APN name must be obtained
• Disable any PIN code / Username and Password
• Preferable to have a fixed IP for the SIM card
• Note: one of the scanners must have polling address 00
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GPRS Connection
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GSM/GPRS using 3DLinkPro
Steps for connecting the 3DLevelScanner to the
3DLevelManager:
– Open the manager and start a communication to
the specified phone number using GPRS option
– Send SMS to the 3DLinkPro:
e.g.: CALLAPM,212.235.27.113,7040,internet,
– Wait for connection
• Note: In order to make the connection, in the local
network, a port forwarding option must be activated
to the computer’s local IP Address
• SMS to reset the 3DLinkPro: HW MODEM RESET
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Smart GPRS
• Enables sending text messages (SMS) for GPRS connection
via the SMS Server
• SMS Server = GSM Modem connected to a computer + APM’s
application running
• Connection via the 3DLevel Manager software tool
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3DLinkPro – Computer Connection
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Modem Wizard
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Fill required fields under “Modem Details”
Press “Analyze!”
Results appear in “Analyzed Info”
If all fields are filled, communication is ok and ready for
connection
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3DLinkPro Configuration via Modem
Wizard
 Modem Wizard is not recommended for use as all
3DLinkPros are configured prior to shipping
 Enables configuration of Username/Password (if any)
 Enables configuration of 4 different operation modes,
depending on the country and the cellular provider:
Mode # Band
Description
0
GSM 900MHz + DCS 1800MHz
Europe / Israel
1
GMS 850MHz + PCS 1900MHz and
AutoBand selection mode
USA (ISPs: AT&T & MNVO (Kore,
Aeris, nPhase)
2
GMS 850MHz + PCS 1900MHz and
AutoBand selection + SIM
Application Toolkit enabled mode
USA (ISPs: T-mobile & MNVO (Raco
, Sensor Logic, Nexaira Jasper
Wireless)
3
GSM 900MHz + PCS 1900MHz
Mexico
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TCP/IP Connection
 It is possible to convert the RS485 serial bus to a TCP packet
and transfer it over Local Area Network (LAN) using a
compatible device
 APM recommends to use model BF-430 manufactured by
Scanner Scanner Scanner
Scanner
CHIYU
1
2
3
n
RS485(+)
RS485(-)
120 Ω
120 Ω
RS485(-)
RS485(+)
n = 1...64
IP Address: 192.168.2.124
IP Port: 7024
IP Network
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TCP/IP
 Setup example
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Modbus (RTU)
• RS485 Serial communication method designed for industrial
devices for controlling and monitoring
• Using standard Modbus commands the measure data can be
received by the connected controller
• Note: When using Modbus (via the RS485), do not use the
3DLevelManager in parallel
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Explosive Installations
• ATEX II 1/2D, 2G (Head-zone 21,
Antenna-zone 20)
• FM CL I,II Div I GP CDEFG
• For explosive areas, the decision
whether or not to put up barriers is up to
the customer
Link to the Control Drawing:
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THANK YOU!
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Conference
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