Garnet SeeLevel Access T-DP0301-B User manual

USA
Garnet US Inc.
5360 Old Granbury Road
Granbury, TX 76049
CANADA
Garnet Instruments
286 Kaska Road
Sherwood Park, AB T8A 4G7
garnetinstruments.com
1-800-617-7384
IMPORTANT OPERATOR INFORMATION
DATE INSTALLED:_______________________________________________________________________________
UNIT NUMBER:_________________________________________________________________________________
COMPARTMENT: _______________________________________________________________________________
DISPLAY CALIBRATION UNITS (e.g. inches, gallons): ___________________________________________
MINIMUM TANK READOUT: ___________________________________________________________________
MAXIMUM TANK READOUT: ___________________________________________________________________
FULL SCALE ANALOG CALIBRATION VALUE: ___________________________________________________
SERIAL NUMBER : ______________________________________________________________________________
NOTES: _________________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
_________________________________________________________________________________________________
Data Portal & Remote Display
with 4-20 mA Output and Serial Interface
MODEL T-DP0301-B
RS-485 Version

Page 2 T-DP0301-B Manual
Table of Contents
CHAPTER 1 - INTRODUCTION....................................................................................3
CHAPTER 2 - FEATURES.................................................................................................4
CHAPTER 3 - WIRING DIAGRAMS.............................................................................5
CHAPTER 4 - DISPLAY PROGRAMMING .................................................................7
CHAPTER 5 - SERIAL INTERFACE................................................................................9
CHAPTER 6 - TROUBLESHOOTING GUIDE........................................................... 14
CHAPTER 7 - SPECIFICATIONS.................................................................................. 15
CHAPTER 8 - SERVICE & WARRANTY INFORMATION .................................... 16
T-DP0301-B_v5.0 - 13-Mar-2020
Data Portal & Remote Display
MODEL T-DP0301-B
RS-485 Version
with 4-20 mA Output and Serial Interface

Page 3
T-DP0301-B Manual
CHAPTER 1 - INTRODUCTION
C
ongratulationsonpurchasingtheGarnetInstruments SEELEVELAccess ™
Data Portal. The SEELEVELAccess
™ compliments the SEELEVEL

™ 806-B, 806-Bi, or SEELEVE ™ 808-P2 and 
 II 810-PS2 gauges by providing an additional volume readout
in the cab of your truck.
In addition to providing readout of the tank level, the SEELEVELAccess
™
          
displayed. This analog output can be used to communicate the tank

Electronic Logging Devices (ELD).
The full scale value of the analog output can be set using the buttons on
the back of the display, no additional equipment is required for calibration.
The SEELEVELAccess
™ also contains a serial RS-485 interface which allows

gauge. The interface is full duplex and contains security features to
prevent unauthorized access.
The SEELEVELAccess
™ display has been designed to withstand the
vibration and shock encountered in mobile applications. While the 808-P2
and 810-PS2 operate on internal batteries, (12 volt truck power is used to
operate the back light and external alarms), the SEELEVELAccess display
operates on 12V truck power.
Signal from
806-B / 806-Bi / 808-P2 / 810-PS2
Analog Output
4-20 mA
Digital Input/Output
ALARM
BYPASS
S
EE
L
EV E
L A
NNIHILATOR
MADEI N
CANADA
Data Portal & Remote Display
with 4-20 mA Output and RS-485 Serial Interface
+12 V
RS-485 serial interface

Page 4 T-DP0301-B Manual
CHAPTER 2 - FEATURES
T
he SEELEVEL Access ™ 

Standard SEELEVEL Access Features
1. The signal between the 806-B, 806-Bi, 808-P2 or 810-PS2 display and
the SEELEVELAccess ™ is digitally encoded so the signal line can be
connected using a standard 7 pin trailer plug.
2. The display operates on 12 volt truck power, and draws less than
200 mA.
3. All-digital design eliminates reading drift or degradation, ensuring
long term accuracy under all operating conditions.
4. Operation from -40 °C to +60 °C (-40 °F to +140 °F) ambient
temperature.
5. Easy installation and servicing with a one year limited warranty.
Additional SEELEVEL Access T-DP0301-B Features
6. An analog 4-20 mA output, with 4 mA corresponding to zero displayed
volume, and 20 mA corresponding to the full scale displayed volume
programmed into the remote display.
7. An RS-485 serial interface available to connect to a a variety of ELD or

8. The model SEELEVELAccess ™ provides an easy-to-read LED display
inside a compact, edge-view enclosure, optimized for top-of-dash or
overhead console mounting. The display is housed in an aluminum
enclosure 2.7” wide x 1.1” high x 3.4” deep (68 mm wide x 29 mm high
x 87 mm. deep).
9. A dimmer button switch enables the operator to control brightness.
10. Simple 6 wire electrical installation - 12V power (red), ground (black),
gauge signal (yellow), analog output (white/blue), RS-485 positive
data (purple) and RS-485 negative data (grey).

Page 5
T-DP0301-B Manual
CHAPTER 3 - WIRING DIAGRAMS
T
HE SEELEVELAccess ™ has been designed for easy installation with your
806-B, 806-Bi, 808-P2 or 810-PS2 series SEELEVEL
™ gauge. Installation
instructions for the gauge were supplied with the equipment, and are
available online at
www.garnetinstruments.com .
The SEELEVEL Access
™ Remote Display is easy to install:
PURPLE RS-485 POSITIVE DATA
GREY RS-485 NEGATIVE DATA
SeeLeveL
Access
PURPLE RS-485 POSITIVE DATA
GREY RS-485 NEGATIVE DATA
SeeLeveL
Access
808-P2 Wiring Diagram
810-PS2 Wiring Diagram

Page 6 T-DP0301-B Manual
PURPLE RS-232 RECEIVE
GREY RS-232 TRANSMIT
806B GAUGE
SeeLeveL
Access
PURPLE RS-232 RECEIVE
GREY RS-232 TRANSMIT
806Bi GAUGE
SeeLeveL
Access
806-B Wiring Diagram
806-Bi Wiring Diagram

Page 7
T-DP0301-B Manual
CHAPTER 4 - DISPLAY PROGRAMMING
The
SEELEVELAccess ™ display shows the tank level by repeating
the information shown on the 806-B, 806-Bi, 808-P2 or
810-PS2 gauge. The 4-20 mA analog output is calculated from the
display level with a 4 mA output corresponding to a display level
of zero, and a 20 mA output corresponding to the full scale level
programmed into the SEELEVEL Access ™ display.
For example, if the full scale is programmed to be 500.0, then a
display value of 400.0 will result in an analog output of 16.80 mA.
The display will recognize the decimal location and adjust the
output accordingly, so in this example a display value of 400 will
also result in an analog output of 16.80 mA.
To set the full scale level:
1. Determine the maximum volume that can be displayed and
pick a full scale amount that is equal to or greater than this
volume.
2. Press both the NEXT MENU and UP/ENTER buttons on the
back panel, the display will show ACAL. Release both buttons.
3. The display will show the existing calibration with the left digit
bright. Press the UP/ENTER button to change the bright
digit. Press the NEXT MENU button to go to the next digit.
4. Set all 4 digits, then press NEXT MENU again to set the
decimal point, it will be bright to indicate that it is selected.
Press the UP/ENTER button to select either x.xxx, xx.xx, xxx.x
or no decimal. For best accuracy of the analog output, try to
use all 4 digits such as 500.0 instead of just 500.
5. After the decimal as been set, press NEXT MENU again,
the display will show Stor. Press UP/ENTER to store the
calibration and exit the setting menu. The display will continue
to show Stor for a moment and then will show donE for a
second. Then normal operation resumes.
6. If you do not want to store the calibration, press NEXT MENU
again and the display will show Abrt. Press UP/ENTER to
abort which exits the calibration menu without saving.
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.

Page 8 T-DP0301-B Manual
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 9
T-DP0301-B Manual
CHAPTER 5 - SERIAL INTERFACE
 ELD Link Format and Signal Format-RS-485
• This documents the supported data exchange format between
the SEELEVELAccess ™ In Cab Display and a vehicle's ELD / Fleet
Management unit.
• Version 1.2, January 3, 2019. Initial Release, plus two revision.
• The supported signal format is half duplex serial, RS485 voltage
levels, 9600 baud, 8 bit, no parity, 1 stop bit.
•  hardware will act as a slave with an address of 0x19.
•  hardware will have a 120 ohm termination resistor installed
but not bus bias resistors.
• All messages (ELD MASTER ->  Slave) obey the following
format: [Destination:  address = 0x19] [Originator: Master
address = 0x00] [total number of bytes in message] [message ID]
[payload - optional depending on message] [Checksum (16 bit: 2
bytes)]
• All messages ( Slave -> ELD MASTER) obey the following
format: [Destination: Master address = 0x00] [Originator: Garnet
address = 0x19] [total number of bytes in message] [message ID]
[payload – optional depending on message] [Checksum (16 bit: 2
bytes)]
• 
• Total number of bytes in message (1 byte)
• Message ID (1 byte)
• Payload (optional depending on the message)
• Checksum (2 bytes) = direct sum of all preceding bytes, truncated
to 2 bytes
• Allow for a 50ms timeout for replies ( Slave -> ELD Master)
• The master must respond to handshake requests within 500ms.
• There must be a minimum of 5ms dead-band (bus inactivity) between
messages on the bus. Any data between these dead-bands will be
considered as one message and will be parsed as such.
 Query Message (ELD Master->  Slave)
• Value: 0x00
• Allows the ELD to query the  device
• [0x19][0x00][0x06][0x00][ 0x00][0x1F]

Page 10 T-DP0301-B Manual
 Query Response ( Slave -> ELD Master)
• Value: 0x01
•  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
 device supports a unique serial number, it will follow (8 bytes
in length).
• Example:  model ID = 0x01, hardware rev = 'E' (0x45), software
major rev = 0x05, minor rev = 0x14, no alarm capability = 0x00 (0x01
= alarm capable), serial number supported = 0x01 (serial number
not supported = 0x00), and a serial number = 0x0102030405060708:
• [0x00][0x19][0x14][0x01][0x02][0x45][0x05][0x14][0x00][0x01][0x01]
[0x02][0x03][0x04][0x05][0x06][0x07][0x08][0x00][0xB3]
 Handshake Demand Message ( Slave -> ELD Master)
• Value: 0x02, 1 byte payload
• ELD must respond with the proper coded response in order to either
begin or continue the transfer or broadcast of liquid levels from the
 device. Handshake demands will be broadcast at random
times.
• Example:
• [0x00][0x19][0x07][0x02][0x3E][ 0x00][0x60]
ELD Handshake Response (ELD Master ->  Slave)
• Value: 0x03, 1 byte payload
• To calculate the response, the payload from the  Handshake

of the lookup table.
• Response to example above:
• [0x19][0x00][0x07][0x03][0x85][ 0x00][0xA8]
Handshake Accepted Acknowledge Message ( Slave -> ELD
Master)
• Value: 0x04, no payload
• This message exists to preserve the Master/Slave communication
arrangement.
• No response at all implies that the handshake was wrong.
• This is not used during the normal commands here, it is just in place
for future applications.
• [0x00][0x19][0x06][0x04][ 0x00][0x23]

Page 11
T-DP0301-B Manual
Send Liquid Level Message (ELD Master ->  Slave)
• Value: 0x05, no payload
•  responds with a single liquid level or a handshake demand
message.
• [0x19][0x00][0x06][0x05][ 0x00][0x24]
 Query Alarm Liquid Level Message (ELD Master -> 
Slave)
• Value: 0x07, no payload
•  will either respond with a liquid alarm level response or an
error response if the alarm function is not supported
• [0x19][0x00][0x06][0x07][ 0x00][0x26]
 Liquid Alarm Level Response ( Slave -> ELD Master)
• Value: 0x08, 7 byte payload
•  responds with liquid alarm level (4 bytes = unsigned int32),
number of digits to the right of the decimal (1 byte), alarm type (1
byte; high = 0x01, low = 0x00), and whether liquid level is currently
in alarm (1 byte; alarm active = 0x01, no alarm = 0x00).
• Example: liquid alarm level = 347.56, alarm type = low level, alarm
active:
• [0x00][0x19][0x0D][0x08][0x00][0x00][0x87][0xC4][0x02][0x00][0x01]
[0x01][0x7C]
 Query Alarm Status Message (ELD Master ->  Slave)
• Value: 0x09, no payload
•  will either respond with current alarm status or an error
response if the alarm function is not supported
• [0x19][0x00][0x06][0x09][ 0x00][0x28]
 Query Alarm Status Response ( Slave -> ELD Master)
• Value: 0x0A, 1 byte payload
•  responds with current alarm status (1 byte; alarm active =
0x01, not active = 0x00)
• Example: alarm active:
• [0x00][0x19][0x07][0x0A][0x01][ 0x00][0x2B]

Page 12 T-DP0301-B Manual
 Error Response ( Slave -> ELD Master)
• Value: 0x0F, 1 byte payload
•  issues this response if a command/message is not supported.
Payload = unsupported message code.
• Example: ELD has previously issued a  Query Alarm Liquid
Level Message (0x07) to a  device which does not support
alarms:
• [0x00][0x19][0x07][0x0F][0x07][ 0x00][0x36]
 Liquid Level Report Message ( Slave -> ELD Master)
• Value: 0x10, 6 or 7 byte payload, depending on whether alarms are
supported
• Slave transmitsliquid level(4 bytes= unsignedint32), number
of digits to the right of the decimal (1 byte), optical error status (1
byte), and alarm status (currently active = 0x01, not in alarm state =

 device which does not support alarms. Optical error status:
no light = 0x00, low light level = 0x01, sunlight = 0x02, no error =
0x10. In the event that the optical error status is in an error condition,
the liquid level and the number of digits to the right of the decimal
is ignored.
• 
value of the level, not the BCD value.
• Example: liquid level = 1,083.1, no optical error, alarms not supported.
• [0x00][0x19][0x0C][0x10][0x00][0x00][0x2A][0x4F][0x01][0x10][ 0x00]
[0xBF]
NOTES
• 
• Send liquid level.
• The handshake request is done every 25th time one of these requests
is received. The handshake must be responded to within 500ms, or
else the response is considered invalid. If no handshake is received,
is late, or is incorrect, then no response is sent. This helps prevent
“brute force” codebreaking attempts.
Handshake format:
• Request from ELD is received by 
•  responds with handshake request if more than 25 requests
have occurred since the last handshake. Otherwise,  sends
reply to ELD request.

Page 13
T-DP0301-B Manual
• ELD sends handshake response
•  sends reply to original ELD request if handshake response is
correct and on time.
• The “handshake accepted acknowledge” message is not used here.
• Upon power-up of the display, the “20 requests” is reset so a

The alarms are not currently supported. In the future, if they are:
• The content of Message $08 is alarm set point, high or low level
alarm, and current alarm status.
• The content of Message $0A is just a short form of Message $08,
alarm status only.
The  will respond to source addresses of 0x00 (ELD) only.
The  will not respond at all to any message that has errors, has
an invalid message, is not addressed to , does not come from
0x00 (ELD), and does not follow the handshake protocol. This avoids
unnecessary bus activity and possible contention, and makes it harder to

Query of Handshake Frequency (ELD Master->  Slave)
• Value: 0x2D, no payload
• This asks for the handshake frequency, response is shown below.
• Message format:
• [0x19][0x00][0x06][0x2D][0x56][0x56]
Handshake Frequency Response ( Slave->ELD Master)
• Value: 0x2E, 1 byte payload
• The handshake frequency number occupies 1 byte in EEPROM in the
 gauge. The frequency can range from 1 to 255 broadcasts
per handshake request. The number is stored in hex from 0x01 to
0xFF.
• Message format, frequency is 25 (0x19):
• [0x00][0x19][0x07][0x2E][0x19][0x6C][0x56]

Page 14 T-DP0301-B Manual
CHAPTER 6 - TROUBLESHOOTING GUIDE
Accuracy:
The analog output has an accuracy of ± 0.25% of the full scale
value, so any output value should be within 0.05 mA of the “ideal”
value. There are no user adjustments that can be made to alter
the accuracy.
          
errors inherent in the mathematical process. However, since the
SEELEVELAccess ™ utilizes a 10 bit digital to analog convertor, it has

to be realized. Note that the truck gauge sending the data has a
resolution of only 8 bits (1/3” systems).
Error Code Cause Solution
no S
The display is not receiving
any signal from the 806-B,
806-Bi, 808-P2 or 810-PS2
gauge.
The analog output will go

the error condition from
the zero display condition
of 4 mA.
Check the wiring
and grounding
for errors or bad
connections.
Also ensure
that the 806-B,
806-Bi, 808-P2
or the 810-PS2 is
working properly.
Err
The display is receiving
corrupted data and the
analog output will go to
0 mA.
EErr The display cannot
communicate with its own
memory, The display
will need to
be serviced or
replaced.
sErr The display cannot
communicate with its own
digital to analog convertor.

Page 15
T-DP0301-B Manual
CHAPTER 7 - SPECIFICATIONS
Analog output accuracy: "0.25% of full scale value
± 0.05 mA"
Minimum input supply voltage: +10.0 V

supply voltage and voltage on analog
4-20 mA output:
4.0 V
Current drain: 200 mA or less
Temperature range: -40°C to +60°C (-40°F to +140°F)
Enclosure:
Material: Aluminum
Size: 68 mm wide x 29 mm high x 87 mm
deep (2.7" wide x 1.1" high x 3.4" deep)
Display type: LED 4-digit, 7 segment
10 mm (0.4") high digits
Display power: Operates on 12 V truck power
Wiring:
6 wire electrical installation: 12 V power
(red), ground (black), gauge signal (yellow),
analog output (white/blue), RS-485 serial
positive data (purple), and RS-485 negative
data (grey)
RS-485 output voltage level: +/- 2.0 V minimum
RS-485 serial format:
9600 baud
Standard mark/space NRZ format
Mode is 8 bits
Non-interverted tx
No parity
No break character
One start bit
One stop bit

Page 16 T-DP0301-B Manual
T
he warranty will only apply if the warranty has been registered online from the Garnet
Instruments registration web page.
DISCLAIMER OF WARRANTY ON HARDWARE
Garnet Instruments warrants equipment manufactured by Garnet to be free from defects in
material and workmanship under normal use and service for a period of one year from the date
of sale from Garnet or an Authorized Dealer. The warranty period will start from the date of
purchase or installation as indicated on the warranty card. Under these warranties, Garnet shall
 
invoiced price of the product. Garnet shall not be liable in any case for labor charges for indirect,
special, or consequential damages. Garnet shall not be liable in any case for the removal and/or
reinstallation of defective Garnet equipment. These warranties shall not apply to any defects or
other damages to any Garnet equipment that has been altered or tampered with by anyone other
than Garnet factory representatives. In all cases, Garnet will warrant only Garnet products which

particular product. In addition, Garnet will warrant only those products which have been installed

LIMITATION ON WARRANTIES
These warranties are the only warranties, expressed or implied, upon which products are sold by

respect to the products sold. Garnet products or parts thereof assumed to be defective by the
purchaser within the stipulated warranty period should be returned to the seller, local distributor,
or directly to Garnet for evaluation and service. Whenever direct factory evaluation, service or
            
Material Authorization (RMA) from Garnet Instruments directly. No material may be returned
to Garnet without an RMA number assigned to it or without proper factory authorization. Any
returns must be returned freight prepaid to: Garnet Instruments, 286 Kaska Road, Sherwood Park,
Alberta, T8A 4G7. Returned warranted items will be repaired or replaced at the discretion of Garnet
Instruments. Any Garnet items under the Garnet Warranty Policy that are deemed irreparable by
Garnet Instruments will be replaced at no charge or a credit will be issued for that item subject to

If you do have a warranty claim or if the equipment needs to be serviced, contact the installation
dealer. If you do need to contact Garnet, we can be reached as follows:
CANADA UNITED STATES
Garnet Instruments Garnet US Inc.
286 Kaska Road 5360 Granbury Road
Sherwood Park, AB T8A 4G7 Granbury, TX 76049
CANADA USA
email: [email protected] email: [email protected]
CHAPTER 8 - SERVICE & WARRANTY INFORMATION
Go online to seelevelsupport.com/ and select “Register Warranty”.