Mercury 2+, Руководство пользователя

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Mercury 2+ Operator Terminal User Manual Page 75 of 82 2019r0
Registers For Writing Data To The Screen
There will be several ways of achieving this aim as any one
method may be simpler for some users than other methods.
Registers 10...169 : Blanket coverage of the screen
The Mercury 2+ screen supports 8 rows of 40 characters, 320
character positions in total. Each pair of character positions will be
assigned a single Modbus register (160 registers in total). Of the
Modbus register, D0­D7 will represent the right hand character
ASCII value and D8­D15 will represent the left hand character of
the pair.
Register 170 : Cursor Positioning
A single Modbus register will be allocated to the cursor positioning
function. D8­D15 will be the X coordinate and D0­D7 will be the
Y coordinate.
Register 200 : 16 bit Unsigned Integer
A single Modbus register will be allocated which, when written to,
will display, at the current cursor position, the value written as an
unsigned number in the range 0 to 65535.
Register 201 : 16 bit Signed Integer
A single Modbus register will be allocated which, when written to,
will display, at the current cursor position, the value written as a
signed number in the range ­32768 to 32767. Note that positive
numbers will have no leading plus sign, whereas negative numbers
will have a preceding minus sign.
Registers 202...207 : 96 bit Packed Data Float
6 registers will be allocated which, when written to, will display, at
the current cursor position, the value written as a Packed Data FP.
The lowest numbered Modbus address field of the pair will contain
the bits <95:80> and the highest numbered register will hold the
bits <15:0>. The conversion occurs when the higher numbered
Modbus register is written to.
The format of the number displayed will be as follows:­
­X.XXXXXXE­XX
i.e. optional minus, compulsory 1 digit, optional decimal point, up
to 6 optional digits, and an optional 2 digit exponent part (with
optional minus sign).
e.g. 0.05 appears as 5.000000E­2
145.667 appears as 1.456670E2
­1.000 appears as ­1.000000
0.0 appears as 0.0