SP Scientific ULTRA-COOL, Operator'S Manual

Page: 41 / 64

Ultra-Cool RS-232 Programmer’s Reference
Rev 008, 01/12 33
© SP Scientific 2012
The pinout for both the custom wired cable and the null modem adapter is as shown
below:
All other signals of the RS-232 standard are immaterial to this application, or
terminated, as appropriate.
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 a one-, a
one, one-and-a-half, or a two stop bit (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.
