Remote Processing BASIC for the CX-10 Modbus - Manual (Page 37)

BASIC PROGRAMMING GUIDE
2-28
LD@
Syntax: LD@ expr
Where: expr = valid integer address of 00H through 0FFFFH (65535)
Function: Retrieves a floating-point number previously saved with ST@
Mode: Command, run
Use: LD@3000
DESCRIPTION
LD@ is used in conjunction with PUSH, POP, and ST@. Use these commands to save and retrieve floating
point numbers to program RAM.
NOTE: LD@ and ST@ cannot use extended RAM. Only segment 0 RAM (used for running Basic
programs) is used. Use PEEKF and POKEF commands to access this memory.
WARNING: When 128K and 512K RAM are installed, all of memory is cleared on power up and reset.
Do not use LD@ or ST@ to save floating point numbers in segment 0. Use POKE and
PEEK type commands instead.
32K RAM systems have address 7E00H set as MTOP. This location up to 7FFFH may be used to store
variables.
expr is the address in RAM of where a number is stored.
Each floating-point number requires six bytes of memory. expr in the ST@ and LD@ instructions specify the
high address. A number is stored at locations expr through expr-6.
RELATED
ST@, PUSH, POP, PEEKF POKEF
ERROR
BAD ARGUMENT when expr > 65535
EXAMPLE
100 A=REGREAD(9)*.007234
110 PUSH A
120 ST@7F00H
.
.
300 LD@7F00H
310 POP B
320 PRINT "Analog value retrieved=",B
>run
Analog value retrieved=",B