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7. If you press NEXT MENU again from the Abrt display, the
menu will return to the beginning with the left digit selected
by being bright.
8. If the full scale calibration is below 103, the display will be
unable to calculate a valid calibration, and will show cErr
(calibration error) after a few seconds. The existing calibration
will be retained, and the display will return to normal operation.
To view the existing calibration:
1. Press either the NEXT MENU or UP/ENTER button (but not
both) on the back panel, the display will show the existing
full scale analog calibration while the button is held down.
Release the button to return to normal operation.
To test the analog output:
1. While either the NEXT MENU or UP/ENTER button on the
back panel is pressed, the display will show the full scale
calibration and the analog output will go to full scale (20 mA).
This can be used to test or calibrate the equipment connected
to the analog output.
2. While the display is in the calibration mode (entered by
pressing both the NEXT MENU and UP/ENTER buttons) the
analog output will be at 4mA.
Page 8
T-DL0301-A Manual
CHAPTER 5 - SERIAL INTERFACE
SeeLeveL ELD Portal Format and Signal Format
•
The supported signal format is bidirectional serial (separate TX and
RX lines), RS232 voltage levels, 9600 baud, 8 bit, no parity, 1 stop bit.
•
All messages obey the following format: [start sequence] [total
number of bytes in message]
[stop sequence]
•
All multi-byte parameters are transferred big-endian (MSB first)
•
Start sequence: [0xFE][0xFE][0x24]
•
Total number of bytes in message (1 byte)
•
Message ID (1 byte)
•
Payload (optional depending on the message)
•
CRC (1 byte) = direct sum of all preceding bytes, truncated to 1 byte
•
Stop sequence: [0xFF][0xFF][0x2A]
SeeLeveL Query Message
(ELD ->
•
Value:
0x00
•
Allows the ELD to query the SeeLeveL device
•
[0xFE][0xFE][0x24][0x09][0x00][0x29][0xFF][0xFF][0x2A]
SeeLeveL Query Response
(SeeLeveL ->
•
Value:
0x01
•
SeeLeveL responds with model ID (1 byte), H/W Rev (1 byte), S/W
Rev (2 bytes), alarm capability (1 byte), and SN support (1 byte). If
the SeeLeveL device supports a unique serial number, it will follow
(8 bytes in length).
•
Example: SeeLeveL model ID = 0x01, hardware rev = 'E' (0x45),
software major rev = 0x05, minor rev = 0x09, no alarm capability
= 0x00 (0x01 = alarm capable), serial number supported = 0x01
(serial number not supported = 0x00), and a serial number =
0x0102030405060708:
•
[0xFE][0xFE][0x24][0x17][0x01][0x01][0x45][0x05][0x09][0x00][0x01]
[0x01][0x02][0x03][0x04][0x05][0x06][0x07][0x08][0xB1][0xFF][0xFF]
[0x2A]
T-DL0301-A Manual
[message
ID] [payload - optional] [CRC]
SeeLeveL)
ELD)
Page 9
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