ElmoMC SimplIQ Software Manual - Manual (Page 16)

SimplIQ Software Manual
MAN-SIMSW (Ver. 1.4)
3-1
Chapter 3: Communication with the Host
The SimplIQ drive can operate with RS-232 communication or CANopen communication.
This chapter discusses RS-232 communication. Refer to the Elmo CANopen Implementation
Manual for detailed information about
SimplIQ drive operation with CANopen
networking.
The SimplIQ drive can communicate by RS-232 with baud rates of up to 57,600 baud/
second, depending on the sampling time. Refer to the PP[N] command section in the
SimplIQ Command Reference Manual.
3.1 RS-232 Basics
The RS-232 communication operates only between a host and a single drive. RS-232 lines
are full duplex, enabling them to carry bi-directional communications. This means that
the host can transmit to the drive at any time, without considering the current state of the
drive.
RS-232 communication consists of ASCII printable characters only, with certain
exceptions:
ƒ
The characters 0xD (carriage return)
ƒ Certain non-printable characters used as error codes (and listed in the EC command
section in the Harmonica Command Reference Manual)
The basic syntax for RS-232 commands may be of two types:
ƒ
An assignment: {[index]}{[equal sign>}
ƒ A free evaluation:
where:
ƒ
command mnemonic Two (case sensitive) letters assigned to a command
(complete list given in
SimplIQ Command Reference Manual).
ƒ index Index, if mnemonic refers to a vector parameter or
command.
ƒ equal sign The “=” character (optional, if the command assigns a value
to a parameter).
ƒ value Parameter value (optional, if the command assigns a value to
a parameter).
The parameter value may be any legitimate arithmetic or
functional expression, as explained later in this section.
ƒ terminator (carriage return), which is the character 0xD
(13 decimal) or “;”.
An assignment evaluates an expression and stores the result in a variable. A free
evaluation evaluates an expression and sends the result to the terminal.