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3.1 Introduction to Gateway
Gateway is a Protocol Converter / Data sharer for devices like PLCs, inverters (Adjustable Speed Drives),
and other Controllers. Gateway has two serial ports that connect with two different devices. These devices
share data through Gateway. Gateway communicates with a device to get the information required by the
device connected on the other port. The device that requires data is called Destination Device and the device
that provides data is called Source Device. Information could be,
- value of a PLC register.
- status of a PLC coil.
- Command from Source Device to Destination Device to perform any action at the destination end.
3.2 Gateway Operation - Configuration and Communication
Gateway can communicate with any two 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.
Complete configuration for a Gateway using the Gateway Setup is termed as a ‘Project’. A Project consists
of Devices to be attached on two ports, Communication settings for two ports to communicate with two
devices, Register addresses for data transfer, Conditions for data transfer etc.
Gateway can now communicate with the specified devices without any change in the Gateway hardware. To
communicate 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
communicate with the desired device. As two devices are connected on Gateway, it requires two drivers for
communication.
User MUST download Project, PLC1 driver and PLC2 driver in Gateway before installing any
system using Gateway. Gateway can accept drivers and configuration data on either of the ports. User
needs a special IBM download cable for downloading configuration in Gateway.
If any change in the current / working project is made, user must download the changed project in
Gateway.
Pin details of IBM download cable for GWY-00 are as follows:
DB9 Male (Gateway) DB9 Female (IBM)
2 2
3 3
5 5
IMPORTANT NOTE:
AS GATEWAY HAS MULTIPLE SIGNALS ON ITS COMMUNICATION PORTS, IBM CABLE FOR
GATEWAY MUST HAVE ONLY THREE RS232 SIGNALS (TXD, RXD AND GND) AS MENTIONED ABOVE.