GE IS200VRTDH1DAA IS200VRTDH1DAB VME RTD card

Description

GE General Electric Technical Specifications: IS200VRTDH1DAA

Both the MODBUS and DNP protocols are hardware-independent so that the physical layer can be any of a

IS200VRTDH1DAA variety of standard hardware configurations including RS232, RS422, RS485, fiber optics, etc. The 750/760

includes a front panel RS232 port and two rear terminal RS485 ports, one of which can also be configured as

RS422. Data flow is half duplex in all configurations. See Chapter 3: INSTALLATION for details on wiring.

Each data byte is transmitted in an asynchronous format consisting of 1 start bit, 8 data bits, 1 stop bit, and

IS200VRTDH1DAA possibly 1 parity bit. This produces a 10 or 11 bit data frame. This is important for transmission through

modems at high bit rates (11 bit data frames are not supported by many modems at baud rates greater than

300).

The IS200VRTDH1DAA baud rate and parity are independently programmable for each communications port. Baud rates of 300,

1200, 2400, 4800, 9600, and 19200 are available. Even, odd, and no parity are available. See Section 8.2:

COMMUNICATIONS on page 8–2 for further details.

The master device in any system must know the address of the slave device with which it is to communicate.

The 750/760 will not act on a request from a master if the address in the request does not match the relay’s

slave address (unless the address is the broadcast address – see below).

A single setpoint selects the slave address used for all ports with the exception that for the front panel port the

relay will accept any address when the MODBUS protocol is used. The slave address is otherwise the same

IS200VRTDH1DAA regardless of the protocol in use, but note that the broadcast address is 0 for MODBUS and 65535 for DNP.

The relay recognizes and processes a master request (under conditions that are protocol-specific) if the broad

cast address is used but never returns a response.

DNP may be used on, at most, one of the communications ports. Any port(s) not selected to use DNP will com

municate using MODBUS. Setpoint S1 RELAY SETUP / COMMUNICATIONS / DNP PORT is used to select which port

will communicate using DNP.

The maximum time for a 750/760 relay to return a response to any (non-broadcast) master request will never

exceed 1 second.

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