Condec DLR3110 - Manual (Page 38)

34 DLR3110 Rack Mount Digital Pressure Calibrator Manual
• The protocol between the “standard” full duplex and the RS485 only differ by the addition of the origin
and destination address characters.
• All functions performed via the front panel keys can also be performed via the serial full duplex
communications.
6.3.1 Full Duplex Protocol
Communications from the host computer to the DLR:
<*>
NOTE: Destination and origin characters (
Response from the DLR:
<:>
Where:
"<",">" = Brackets are not sent
* = Message from master (host computer [2AH])
: = Response from DLR3110 (3AH)
DD = DLR unit address (two digit) if in RS485
OO = Master address (fixed at 00) if in RS485
If RS485 mode is not selected the "DD" and "OO" are not transmitted.
cmd = Three character command to DLR3110
cmd r = Three character command echoed from DLR3110
{ = Start of data character (7BH)
} = End of data character (7DH)
'{' and '}' only sent if data entry or recall.
data entry = Data entered into DLR if entry command
data resp = Data response from DLR if in response
CHECK = Optional two character check if selected
CR = Message terminator (0DH)
A "LF" character following the "CR" is ignored. All characters following the "CR"
and preceding the "*" is ignored.
6.3.2 Command Code Description
The consists of three (3) characters “ppt” where:
pp = the command parameter (see chart I)
t = the command type
The three (3) command types (t) are as follows:
Direct cmd code = < D > character (44H). “D” commands have no data associated with them
Examples:
• General commands (Zero, Tare, etc.)
• Display Mode commands (Gross, Peak, etc.)
• Weight calibration (Zero Cal, etc.)
Data request code = < R > character (3FH). “R” commands are requests for data from the host to the
DLR
Examples:
• Weight/pressure data
• Status
• Setup data
• Calibration data