snap ethernet-based i/o units protocols and programming guide

Analog Point Calculation and Set—Read Only
When you read data in this area, the data is returned and set.
CAUTION: Reading any portion of a quadlet (for example, the first byte of a four-byte quadlet)
sets the offset or gain but returns only the one-byte value requested, which is incomplete.
Offset assumes that zero-scale counts are on the input. Gain assumes that full-scale counts are
on the input. Offset and gain are typically used for calibration, and offset should be done before
gain.
Only the first four points are shown. Each successive point starts on an even 4 hex boundary and
follows the same pattern.
Starting Address Length Type Description
FFFF F0E0 0000 4 F Point 0: Offset in Engineering Units (float)
FFFF F0E0 0004 4 F Point 1: Offset in Engineering Units (float)
FFFF F0E0 0008 4 F Point 2: Offset in Engineering Units (float)
FFFF F0E0 000C 4 F Point 3: Offset in Engineering Units (float)
(Additional points follow in order on even 4 hex boundaries.)
FFFF F0E0 00FC 4 F Point 63 Offset in Engineering Units (float)
FFFF F0E0 0100 4 F Point 0: Gain (float)
FFFF F0E0 0104 4 F Point 1: Gain (float)
FFFF F0E0 0108 4 F Point 2: Gain (float)
FFFF F0E0 010C 4 F Point 3: Gain (float)
(Additional points follow in order on even 4 hex boundaries.)
FFFF F0E0 01FC 4 F Point 63 Gain (float)
Last valid address for this area: FFFF F0E0 01FF
SNAP Ethernet-Based I/O Units Protocols and Programming Guide 131