Interface to the pi system Version 37 and Greater


Communication Configuration



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Communication Configuration


The interface supports communication to a variety of Yokogawa systems using different communication protocols. The following table indicates which protocols are supported for each Yokogawa system:


DCS System

Communication

Gateway

Interface Platform

Centum V

RS-232C TTY

CGWU

VAX, Alpha VMS

Centum XL

RS-232C TTY

ECGW*

VAX, Alpha VMS

ECGW3

VAX, Alpha VMS

Ethernet TCP/IP

ECGW3

All Supported

Micro XL

RS-232C TTY

No Gateway

VAX, Alpha VMS

Ethernet TCP/IP

Software Emulator

All Supported

Note: If the interface is running on VMS, DEC TCP/IP software (UCX) is required to be able to use the TCP/IP protocol.

Yokogawa Gateway Setup Diagram



Hardware Configuration


To be able to communicate with the gateway, the correct protocol parameters must be set up on the DCS.
Ethernet TCP/IP

The following information must be specified at the DCS:





Character Mode

Binary Mode (ECGW3 only)

Communication Text

Character Mode

Binary Mode

Delimiter Character

CR-LF

None

Sequence Numbers

Yes

Yes

Interrupt Message Mode

Character Mode

Character Mode

See the Interface Startup File section on page 15 for information about how to match the interface with these parameters.

Text can be sent continuously to gateway without waiting for reply. The maximum text count that can be sent in sequence depends on the configuration of each gateway. The continuous text count is specified in the interface startup file using the “/sc” argument (see page 21) and should not exceed the limits of the DCS.


RS-232 Serial TTY (VMS only)

The following information must be specified on the DCS and in the interface port settings file, PISysExe:Ygi_Setterm.com. The protocol does not accept sending text continuously. The settings marked (opt) are optional but must match between the DCS and the port settings.





DCS Settings

Interface Port Settings

Communication Rate

9600 bps (opt)

9600 bps (opt)

Communication Code

8 bit (opt)

8 bit (opt)

Parity

Even (opt)

Even (opt)

Stop Bit

1 bit

N/A

Text

ASCII

N/A

XON/XOFF

Yes

N/A

Sequence Numbers

Yes

N/A

Other Settings

N/A

NoWrap, NoType_Ahead, NoModem


Micro XL Ethernet Requirements


The Micro XL DCS system has the following requirements to be able to communicate with the interface via the Ethernet using TCP/IP:

Yokogawa Products

  • EN83 Ethernet communication card (the Ethernet card for MOPS or MOPL station).

  • MAPF-S221 Ethernet card driver.

  • MAPF-S311 Ethernet computer communications package (ECGW3 emulation software).

Third Party Products

  • Transceiver and cable converter from AUI port to the physical network.

The MOPS and MOPL stations must be upgraded to MIGHTY stations (Y211). The setup will not function on standard (S211), advanced (A211) or enhanced (E211) systems. These systems may have an EN82 Ethernet card but MAPF-S311 emulation software will not work with them. To be sure of what version the station is currently running, reboot the operator station, press the S2 key and check the operating system revision number at the top of the screen. The MIGHTY software has a revision number R1.A# (where # is a number). Performance is most reliable when the Ethernet card is in the engineering station (or wherever the system is configured from).

The MOPS or MOPL station must be given a fixed IP address because DHCP is not supported.




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