Teledyne 300 7.0 RS-232COMMUNICATIONS, RS-232MESSAGE TYPES, Character, Message Type

7.0 RS-232 COMMUNICATIONS

The Model 300 features a powerful RS-232 interface which is used both for reporting test results and for controlling the Analyzer from a host computer. Because of the dual nature of the RS-232 interface, the message format has been carefully designed to accommodate both printers and host computers.

All message outputs from the Model 300 have the following format:

"X DDD:HH:MM IIII MESSAGE<CRLF>"

The "X" is a character indicating the message type (see table below).

RS-232 MESSAGE TYPES

Character		Message Type
W		Warning
C		Control/status
D		Diagnostic
T		Test measurement
V		Variable value
?		HELP screen
	TABLE 7.1

The "DDD:HH:MM" is a time-stamp indicating the day-of-year ("DDD") as a number from 1 to 366, the hour of the day ("HH") as a number from 00 to 23, and the minute ("MM") as a number from 00 to 59.

The "IIII" is a 4-digit Analyzer I.D. number.

The "MESSAGE" field contains variable information such as warning messages, test measurements, DAS reports, etc.

The "<CRLF>" is a carriage return-line feed combination which terminates the message and also makes the messages appear neatly on a printer.

The uniform nature of the output messages makes it easy for a host computer to spare them.

Input messages to the Model 300 have a format which is similar to that for output messages:

"X COMMAND<CRLF>"

P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 61