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Doc No: UMAN\GWY-800-B\0706
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Getting Started
3.2
Introduction To GWY-800-B
GWY-800 is a protocol converter as well as the HART modem. This converts the HART digital signal to a serial
communication protocol (e.g. MODBUS). This allows various HART field devices to interface directly with serial
protocol (MODBUS) based monitoring and control systems. Serial protocol can be master or slave configurable
from the set up software. At the same time it allows to communicate the PC based configuration software with
HART field devices. Gateway operates in point to point as well as in multi drop HART network mode. All HART
process information, including primary, second, third and fourth process variable data is converted to serial protocol
(MODBUS) and available to the host system. Using the Field Device Status Byte data that is available in HART’s
digital information, the gateway can transmit, via serial link, diagnostic data including smart device configuration
changed; primary and non primary variables out of limits; primary variable analog output fixed; cold start; field
device malfunction; and more HART status data available.
GWY-800 has three serial ports; 3 ports; COM1 / PLC1 is
compatible to RS232/RS422/RS485/CMOS levels, which
can be connected to device like PLCs, Inverters, HMIs and controllers. “Pass Through Port” is serial RS232 port.
“HART OUT” port is HART protocol compatible.
GWY-800-B communicates with the HMI using HART protocol. This allows gateway to access various process
parameters from HART port. Gateway provides these parameters to third party serial devices like PLCs, controllers.
The PLC can then make decisions based on the parameters values.
Gateway setup software allows different process parameters to be mapped to any register on the other side PLC/
Device.
Microsoft Windows® based configuration software, Gateway Setup, helps user to configure Gateway unit.
‘Configuration’
means making the Gateway unit work as per the system requirements. The complete configuration for a unit is
termed as ‘Project’. Project comprises of device names, Register addresses,condition for block execution etc.
Block may contain information like copy number of words from one device to other device and conditions for copy, if
any.
Gateway transfers data between two devices by execution of blocks.
After the Project is defined, Drivers for required devices and Project should be downloaded. Gateway can now
communicate with the HART devices and serial devices(e.g. PLC or SCADA).
3.3
GWY-800-B Operation-Configuration And Communication
Gateway can communicate with serial and HART devices using appropriate cables and configuration. Microsoft
Windows
®
based configuration software, Gateway Setup, configures the Gateway unit. ‘Configuration’ means making
the Gateway unit work as per system requirements. In this, user need to configure only “PLC1 / COM1” port and
“HART Out” port. Complete configuration for a Gateway using the Gateway Setup is termed as a ‘Project’.
Gateway can now communicate with the specified devices without any change in the Gateway hardware. To commu-
nicate with a device, Gateway needs Communication Drivers for the devices and ‘Gateway - Device’ communication
cables.
Each Device has a unique and predefined protocol for communication. Gateway driver has this protocol to communi-
cate with the desired device. As two devices are connected on Gateway, it requires two drivers for communication
(Serial “Pass through port” (RS232) is just a data transfer part).
