Remote Processing BASIC for the CX-10 Modbus - Manual (Page 66)

BASIC PROGRAMMING GUIDE
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SGN
Syntax: SGN(expr)
Function: Returns +1 if expr is greater than zero, zero if the expr equals zero, and -1 if expr is less than zero.
Mode: Command, run
Use: PRINT SGN(SIN(X)))
DESCRIPTION
Use SGN in level control applications. If a level is high or low, it can direct control to the appropriate
program.
EXAMPLE
100 ON SGN(A)+1 GOSUB 2000,3000,4000