Garnet SEELEVEL 828 User manual
Printed in Canada
www.garnetinstruments.com
MODEL 828 MANUAL
Serial Interface
Page 2 828 Manual
Table of Contents
CHAPTER 1 - OVERVIEW.............................................................................................3
CHAPTER 2 - DESCRIPTION.......................................................................................4
CHAPTER 3 - INSTALLATION GUIDE.......................................................................7
CHAPTER 4 - SERIAL COMMANDS.........................................................................8
CHAPTER 5 - TROUBLESHOOTING GUIDE......................................................... 19
CHAPTER 6 - SERVICE AND WARRANTY INFORMATION............................ 20
MAIL IN WARRANTY ................................................................................................. 21
GARNET
SEELEVELTM
Serial Interface
MODEL 828
828 Manual_v7.2 - 04-Sep-2018
Page 3
828 Manual
CHAPTER 1 - OVERVIEW
Congratulations on purchasing the Garnet Instruments Model
828 SEELEVEL™ Serial Interface. The Model 828 is designed to
interface up to six 808P2/810PS2 displays or one 806B display to
a standard RS232 serial connection for data acquisition. This can
be connected to a remote computer, PLC or cellular modem and
an external printer can be attached to a second serial port to print
receipts for historical PTO events. There is a Power Take Off (PTO)
sense line to determine when transmitted data is required. This
prevents false readings from being transmitted while the truck is
moving.
Page 4 828 Manual
CHAPTER 2 - DESCRIPTION
The 828 has a 4x16 LCD display to congure the setup options,
verify connections, help with troubleshooting, and to display
the levels of the SEELEVEL™ gauges. The number of levels displayed
corresponds to the number of compartments congured.
Historical PTO events are saved to memory. These events log the
time and volume when a PTO is turned on and when the PTO is
turned off. The PTO events can be retrieved from memory through
the serial connection, or time stamped receipts can be printed
using a portable printer.
Many of the 828 keypad buttons require a ve digit numeric
password authentication before they can be used. The default
password is “11111”. Entering the last three characters ‘111’
correctly provides Level 1 Access which enables the CLOCK button.
Entering all ve digits correctly provides Level 2 Access allowing all
functions. The PRINT, LIGHT, VERSION, and DATALOG buttons are
always available. Access to Level 1 and 2 expires after 10 minutes.
The password can be changed using the Set Password Key serial
command. If in Geotab New (mode 2) the password “99991”
will provide access to the MENU button functionality to change
the mode back to ASCII (mode 0) so the Set Password Key serial
command could be used to reset the password.
Description of Keypad Buttons:
ENTER button: This button is used to store setup changes into
programmer memory.
ESC button: This is used to exit various menus.
button: This button is used to navigate through setup menus.
button: This button is used to navigate through setup menus.
button: This button is used to navigate through setup menus.
button: This button is used to navigate through setup menus.
PRINT button: Select a tank and historical PTO event to print and
send its level out the printer serial port .
LIGHT button: This turns the display backlight on and off.
SHIFT button: This button is used to select the button functions
printed in red. SHIFT must be held down while pressing the other
button.
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828 Manual
SET CLOCK+SHIFT button: Set the on board real time clock.
Use the up and down buttons to change the highlighted time/
date, and the sideways buttons to select which item to set. Use
the ENTER button to save the time and date shown, and exit the
menu. To exit the menu without saving, use the ESC button.
SET PTO POLARITY+SHIFT button: Select whether the PTO is
active when high or low polarity is present on the PTO wire. Use
the up and down buttons to change the selection. Use the ENTER
button to save the value shown, and exit the menu. To exit the
menu without saving, use the ESC button.
SET PTO PULLUP+SHIFT button: Select whether the PTO pull-up
is on or off. Use the up and down buttons to change the selection.
Use the ENTER button to save the value shown, and exit the menu.
To exit the menu without saving, use the ESC button.
SET PTO DELAY+SHIFT button: Sets the delay after the PTO is
engaged or disengaged before a serial data transmit is done. Use
the up and down buttons to change the value shown. Use the
sideways buttons to select the engage or disengage delay. Use
the ENTER button to save the value shown, “st” will be shown for a
couple of seconds to verify that the value has been stored. Once
the new values have been stored, use the ESC button to exit the
menu. Any changes made after pressing the ENTER button will
not be stored.
VERSION+SHIFT button: Shows the hardware and software
version of the 828.
SET NO. TANKS+SHIFT button: Set the number of compartments
to be monitored and displayed on the LCD screen for updates. This
should match the number of SEELEVEL™ gauges. Use the up and
down buttons to change the value shown. Use the ENTER button
to save the value shown, and exit the menu. To exit the menu
without saving, use the ESC button. Currently, 806 gauges can
only monitor compartment one. The 806 gauge must be viewing
compartment one to work.
SET TX INTERVAL+SHIFT button: Sets the interval between
automatic serial data transmissions of the levels shown on the
display. This can be from 1 to 99,999 seconds. Use the up and
down buttons to change the highlighted digit. Use the sideways
buttons to select a different digit. Use the ENTER button to save
the value shown, and exit the menu. To exit the menu without
saving, use the ESC button.
Page 6 828 Manual
SET TX IN OPTIONS+SHIFT button: Sets the transmit interval
options. The 828 can be congured to send or not send interval
updates during the time that the PTO is disengaged. Updates are
always sent during the time that the PTO is engaged. Use the up
and down buttons to change the selection. Use the ENTER button
to save the value shown, and exit the menu. To exit the menu
without saving, use the ESC button.
MENU button: Sets the 828 Mode and Gauge type. Use the up
button to set the 828 to 806 gauge viewing compartment one.
Use the down button to set the 828 to use 808 and 810 gauges.
Use the right and left buttons to select ASCII (mode 0), Geotab Old
(mode 1), or Geotab New (mode 2) serial transmit modes. Use ESC
button to exit.
In mode 0, which is the default, ASCII characters are sent out when
PTO changes occur, interval updates are sent, and compartment
data has been scanned.
In mode 1, Geotab’s RS232 Extended Data Message Format GO2/
GO3/GO4 is used when PTO changes occur and interval updates
are sent.
In mode 2, Geotab’s Third Party Data (Message Type 0x80) protocol
is used when PTO changes occur and interval updates are sent.
DATA LOG button: Send all the historical PTO events out the
serial port.
DATA LOG+ SHIFT button: Clear all historical PTO events from
memory.
Note that if one of the set menus is entered and there has been
no button pressed for one minute, the menu will automatically exit
without saving. This way the system cannot be accidentally left in
one of the set menus where it will not respond to serial data.
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828 Manual
CHAPTER 3 - INSTALLATION GUIDE
1. The 828 is not weatherproof. The connectors on the ends of
the 828 need to be clear of obstructions. Ensure that the unit
is mounted in an appropriate location.
2. The 828 needs to be supplied with +12VDC from the truck
through a 1 amp fuse along with a good chassis ground.
3. One signal wire needs to be fed from the truck’s PTO to the
PTO INPUT on the 828. This wire needs to either have an active
high or active low signal.
4. The six remote inputs allow a single 828 to communicate with
up to six different SEELEVEL gauges. Connect the remote outputs
from the SEELEVEL 806B, 806Bi, 808P2 or 810PS2 systems to
the REMOTE wire inputs on the 828. NOTE: The ground used
for the 828 has to be the same ground connection used for
the 806B, 808P2 or 810PS2.
5. Connect the serial data port to the serial device using a
standard 9 pin serial cable.
6. The serial port settings for both serial ports are 9600 baud, no
parity, 8 data bits, 1 stop bit ASCII communications.
Printer Tx
RS232Rx
RS232Tx
+12 VDC
Ground
PTO
Remote 1
Remote 2
Remote 3
Remote 4
Remote 5
Remote 6
Printer
Serial Port Serial Data
Port
Page 8 828 Manual
CHAPTER 4 - SERIAL COMMANDS
The following section describes the dened 828 serial commands.
The serial data requests are ASCII data strings. Throughout
this section <CR> represents a single carriage return character
(hexadecimal 0x0D). In this section Red text represents serial
data being received by the 828. Blue text represents serial data
being transmitted from the 828. Either uppercase or lowercase
characters can be used, the response will be in the case that is
used to make the request.
Set Password Key
‘k=11111’ sets the ve digit numeric password key.
k=11111<CR>
k,11111<CR>
Request Password Key
‘k’ requests the the ve digit numeric password key.
k<CR>
k,11111<CR>
Set Gauge Type (808/810 or 806)
Set the type of gauge connected to the 828. ‘g=0’ for 808 or 810,
‘g=1’ for 806.
808 or 810 806
g=0<CR> g=1<CR>
g,0<CR> g,1<CR>
Request Gauge Type (808/810 or 806)
‘g’ requests the type of gauge connected to the 828.
808 or 810 806
g<CR> g<CR>
g,0<CR> g,1<CR>
Currently, 806 gauges can only monitor compartment one. The
806 gauge must be viewing compartment one to work.
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828 Manual
Mode conguration
The 828 can be set up to operate in three modes of operation.
‘m=0’ sets mode 0, ‘m=1’ sets mode 1, and ‘m=2’ sets mode 2.
IMPORTANT NOTE: The 828 only accepts serial commands when
in mode 0 or 1. If the 828 is set to mode 2 via a serial command,
it can only be set back to mode 0 or 1 via the front keypad MENU
button.
m=0<CR> m=1<CR> m=2<CR>
m,0<CR> m,1<CR> m,2<CR>
In mode 0, which is the default, ASCII characters are sent out when
PTO changes occur, interval updates are sent, and compartment
data has been scanned.
In mode 1, Geotab’s RS232 Extended Data Message Format GO2/
GO3/GO4 is used when PTO changes occur and interval updates
are sent.
In mode 2, Geotab’s Third Party Data (Message Type 0x80) protocol
is used when PTO changes occur and interval updates are sent.
Request Mode
‘m’ requests the mode from the 828.
Mode 0 Mode 1
m<CR> m<CR>
m,0<CR> m,1<CR>
Page 10 828 Manual
PTO change (Mode 0)
During normal operations, a change of PTO status causes the 828
to send out a comma separated list of values corresponding to the
PTO status followed by the number of channels being monitored.
The transmit is done after a programmable delay.
p,E,11.16,79.00, 0.00, 0.00, 0.00, 0.00<CR>
The next example shows the PTO disengaged and only two
channels being monitored.
p,D,11.16,79.00<CR>
The next example shows the PTO engaged and all six compartments
having invalid data.
p,E,NOSIG,NOSIG,NOSIG,NOSIG,NOSIG,NOSIG<CR>
The level reading will always be ve characters including the
decimal place. If no decimal place is present a space character will
pad the least signicant byte. NOSIG shows no valid level data.
ERROR shows level data error.
PTO change (Mode 1)
During normal operations, a change of PTO status causes the 828
to send out a message compatible with Geotab’s “RS232 External
Data Message Format GO2/GO3/GO4”.
Byte Value Description
0STX 0x02
1 Message Type 1 0x01
2 Body Length (x) 1-27
3 to 2+x Data x byes of data, max of 30 bytes
3+x to
4+x
Checksum 2 byte checksum (big endian) of
bytes 0 to 2+x with 0x01 added
to each byte before summing
5+x ETX 0x03
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