This document is not contractual and the specification / detail may be modified at any time without prior notice.
E:
T:
+44 (0)113 286 0166
GDS TECHNOLOGIES LTD
|
FUSION POINT
|
ASH LANE
|
GARFORTH
|
LEEDS
|
LS25 2GA
|
UK
GDS Terminal Commands
Command
Use
A = Set CAN address
Sets the CAN address
G = Select gas type
Select the gas type from a list
Z = Zero
Press when no gas on sensor to give zero
S = Span
Use when calibration gas applied,
H and L change reading
D = Enter calibration date
Enter the calibration date
Y = Toggle auto zero
Auto zero is ON or OFF, small drift is cleared
H = Set high alarm
Sets the high alarm threshold
L = Set low alarm
Sets the low alarm threshold
O = Set over range alarm
Sets the over range alarm threshold
P = List command
List these commands on screen
X = Exit calibration mode
Exit this PC mode
$ = Initialise this sensor
Use on new PCB to set gas type to Flam
U = Alarm direction
Sets rising or falling alarms
R = Range
Allows a change in maximum value
N = Decimal points
Toggles between 1 and 2 decimal places
E = Edit user gas text
Choose gas description
B = Toggle deadband
Deadband of 2.5% can be on or off
F = Toggle fault Input
External fault input contact can be disabled
K = Select Input
Used to select the input from between Input J6 to input J14
(Toxic Only)
# = Local Relay Setup
Used to change the function of the 3rd relay from
Fault to Over-Range
V = View gas log
From current log, display how many historical
readings to display, up to 2880
% = Clear gas log
Set all 2880 log readings to 0.00
I = Log interval log
Choose how many seconds between each
reading and whether the log will roll over or
stop at 2880 (60 second interval and 2880
readings = 48 hours)
Space Bar = Enter Data / Load Data Used to load sensor information after connecting to GDS Terminal
W = Set 4-20mA output
Adjusts the digital 4-20mA Output values
* = Toggle Baud Rate
Switches the Baud rate between 20kBits and 40kBits.
Using magnets or push buttons (set up)
continued
Removing both magnets as instructed on the LCD presents the first part of
this multi menu which is ZERO. With no gas present use the left magnet
to increase the reading and the right magnet to decrease to achieve a
zero reading on the display. A timer is displayed on the LCD and when
this reaches 0, the next menu is displayed. This timer is 15 seconds
approximately and is reset back each time a magnet is near, timeout can
be speeded up by placing a magnet near to the centre position.
SPAN is the next part of the menu and gas should be applied to the sensor
at this time.
The left magnet increases the gain and the right magnet reduces gain.
The actual sensor value can be seen on the display to rise or fall respectively.
LOW ALARM
is the next menu and left and right magnets increase and
decrease this value.
HIGH ALARM
is next followed by
OVER RANGE
alarm.
The direction of the alarms is displayed as ^ for rising and v for falling but
these can be changed using left and right magnets together.
Using magnets or push buttons (set up)
The Combi sensors which have an LCD display fitted also incorporate 3 reed
switches which can be activated using external magnets through the glass
window of the flameproof XDIwin enclosure.
These magnets do not
act instantly and have to be in close proximity to L, M and R on
the front display for a few seconds to activate a software setup
function.
The left magnet
enters the Auto zero ON or OFF menu.
This allows small drift changes in the sensor to be compensated for but is
not operational when the sensor readings are greater than 5% of full scale.
Therefore auto zero is inactive when a larger gas reading is present. When the
remove magnets message appears, move the left magnet away and then the
display shows if auto zero is ON or OFF. The left magnet puts auto zero ON
and the right magnet turns it OFF. With no magnets present, the display will
return to normal after a few seconds timeout.
The right magnet
allows the CAN address of the sensor to be changed.
When the ADDRESS menu is displayed with a prompt to remove the magnet,
and then the display shows the address and that the right magnet decreases it
whilst the left magnet will increase it. This is then stored in internal non volatile
memory and the display will automatically revert to normal operation.
The centre magnet
is used to inhibit the sensor. As with the left and right
magnet functions the display requests that you remove the magnet and then
the state of the inhibit appears on the LCD. The left magnet then puts the sensor
into inhibit whilst the right magnet removes it. An amber LED on the front panel
under the LCD flashes when the sensor is inhibited. When all magnets are
removed, the display will revert to normal operation.
The left and right magnets together allow the calibration menu to
be used.
D
E
E
An example of continuous data output to the PC from a Flammable
sensor is shown below and is the format for all gas types.
O
,
H
and
L
represent the Over Range High
and Low alarms respectively.
D
indicates if a duplicate address is detected
F
indicates a fault present
I
shows that this sensor has its alarms inhibited
under the
O H L
the ^ ^ v represent the direction of the alarms.
L
is falling
and
H
and
O
are rising. A(*) under the letter(s) OHLDFI represents a
detected state so in this example the sensor would be in high alarm and
a fault present.
‘Gas val 35.6’ represents the value of the gas present at the sensor head.
Pressing (R) on the PC causes a reset to occur. Gas type with address
and serial number are then output to the PC together with alarms and
calibration date. A full command list via PC is available by pressing the
letter (P) which will relist on the PC.
Flam %LEL
O H L D F I
^^v
-*--*-Gas val = 35.6
F
G
NOTE: for 2 Wire Direct
transmitters (PCB204)
document C894 see price list
G082 section M
Technical Sheet ref C1882B
XDI
(
win
)
–15/30J
(
win
)
TOXIC/OXYGEN – TRANSMITTER
(PCB 337)
Electrochemical cells
Control Unit
CAN 1 or 2
Sensor
4-Wire Addressable
CANbus
+24
Hi
Lo
0v
4~20mA
+24
Hi
Lo
0v
Control Unit
Addressable Sensor PCB
+24V
Hi
Lo
0v
4~20mA
4~20mA O/P Sensor
(Any device)
4~20mA
+24V
0v
+24V
0v
4~20mA
+24V
Hi
Lo
0v
Control Unit
4~20mA Input
Sensor
3-Wire Direct
4~20mA Signal
Fig 2
Fig 3
Fig 4
+24
Hi
Lo
0v
4~20mA
+24
Sig
0v
W
Y
P
Control Unit
CAN 1 or 2
Sensor
Addressable
+24
Hi
Lo
0v
4~20mA
4~20 IN
SO
SK
+24
Hi
Lo
0v
Control Unit
Addressable Sensor PCB
J10
+24V
Hi
Lo
0v
4~20mA
4~20mA O/P Sensor
4~20mA
+24V
0v
+24V
0v
4~20mA
+24V
Hi
Lo
0v
J11
Control Unit
4~20mA Input
Sensor
3-Wire Direct
4~20mA Signal
+24
Hi
Lo
0v
4~20mA
+24
Sig
0v
Control Unit
4~20mA Input
Sensor
2-Wire Direct
4~20mA Signal
+24
Hi
Lo
0v
4~20mA
+24
Sig
0v
4~20 IN
SO
SK
4~20 IN
SO
SK
J10
J10
J10
