EDC Programmer’s Reference
34 Rev 007, 04/12
© SP Scientific 2012
Communications
Communication operates at a user definable BAUD rate selectable from 300, 1200,
2400, 9600.
Parity may be odd, even, or none. The interface uses one Start bit and either one,
one-and-a-half, or two Stop bits (user selectable). Data word length is selectable at 7
bit data with designated parity, or 8-bit data without parity. All data in both directions is
transmitted in ASCII.
Selections of BAUD rate, parity, and stop bits are made to the microcontroller via the
control panel of the target (application) system.
Communication Data
All programmable, selectable, or switchable functions of the target system are
accessible via the RS 232, with the exception of the RS 232 configuration itself, which
may not be programmed from the host.
All data, programmed values, status, and system errors are accessible by the host,
i.e., an appropriate query by the host will result in a data stream returned from the
system as defined below.
Data Format
All data is transmitted in ASCII. All data values are transmitted via decimal character
strings. Upper and lower case alphabetic characters will be accepted interchangeably.
Data descriptions are identified by direction from the perspective of the system
controller:
Received data: from the host system to the MPC/EDC.
Transmitted data: from the MPC/EDC to the host.
Received Data
Data may be transmitted at any time by the host. Status queries will be answered
whether or not the unit is in local or remote. Any change in system status (except
"Goto Remote") requested via the RS-232, however, will require that the unit be in the
"remote" state; otherwise an error will be reported to the host.
Data uses a "line" format, consisting of the following:
CMD <opt CMD> <opt CMD> <...> CR <opt LF>
CMD is any valid transmitted data string.
CR is an ASCII "Carriage Return."
LF is an ASCII "Line Feed."
Data commands may be grouped within a "line" command, or transmitted singly.
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