GE IS200VSCAH2AAB CIRCUIT BOARD ASM

Description

GE General Electric Technical Specifications: IS200VSCAH2AAB

The CRC-16 algorithm essentially treats the entire data stream (data bits only; start, stop and parity ignored)

IS200VSCAH2AAB as one continuous binary number. This number is first shifted left 16 bits and then divided by a characteristic

polynomial (11000000000000101B). The 16 bit remainder of the division is appended to the end of the packet,

MSByte first. The resulting packet including CRC, when divided by the same polynomial at the receiver will

IS200VSCAH2AAB give a zero remainder if no transmission errors have occurred. This algorithm requires the characteristic poly

nomial to be reverse bit ordered. The most significant bit of the characteristic polynomial is dropped, since it

does not affect the value of the remainder.

These function codes allow the master to read one or more consecutive binary status bits from an 750/760.

The IS200VSCAH2AAB status bits are packed into bytes with the first addressed bit occupying the least significant bit position of

the first returned byte. Enough bytes are returned to contain all requested status bits. The last byte is zero-pad

ded as required. The maximum number of status bits that can be read in a single request is 1920 (although this

greatly exceeds the number of status bits defined in the 750/760).

The addresses of the bits that can be read using these functions are the same as the point indices defined for

the IS200VSCAH2AAB DNP Binary Input objects (e.g., address zero references the “Relay In Service” status). Refer to Section

16.5: DNP 3.0 DEVICE PROFILE on page 16–84 for the definition of all binary status data. Note that function

codes 01H and 02H are identical in their operation.

The following table shows the format of the master and slave packets. The example shows a master device

requesting 10 status bit values starting at address 13h from slave device 11; the slave device responds with

the bit values 1, 0, 1, 1, 0, 0, 1, 0, 0 and 1 from binary status addresses 13h through 1Ch inclusive. Note that

two bytes are required to contain the response data. The first byte contains the first eight data bits stored in the

least significant to the most significant bit position. The second byte contains the last two data bits stored in the

least two significant bit positions. Note that the rest of the second byte is zero-filled.

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