52
TS4000
The following table describes the Base Unit operating modes.
Table 25: Mode Descriptions
Mode
Description
R
UN
Normal mode of operation for the TS4000 BU, IM, and electrochemical
cell. The latter takes readings and outputs them to the IM. The BU then
polls the IM every ten seconds.
W
ARN
L
EVEL
IM reports toxic gas reading exceeding warning level.
A
LARM
L
EVEL
IM reports toxic reading exceeding alarm level.
A
PPLY
G
AS
When the Calibration or Gas Check Modes has been invoked, the apply
gas bit informs the user when to apply gas to the TS4000.
R
EMOVE
G
AS
This bit informs the user to remove the gas after the TS4000 has finished
Calibration or Gas Check.
G
AS
B
EING
R
EAD
This bit informs the user that the gas is being read in either Calibration or
Gas Check Mode.
I
NITIAL
This informs the user that the TS4000 is in Start-up Mode.
C
ALIBRATE
Writing a one (1) to this bit informs the IM to zero and then calibrate the
sensor. The no gas, apply gas, and remove gas informs the user when to
apply or remove gas.
G
AS
C
HECK
This mode will place the TS4000 in Gas Check Mode. The user applies
gas and the sensor current is disabled.
O
K
E
RROR
Cautionary errors (such as low line) that do not force the TS4000 to go
offline but indicate an unsafe operating situation.
B
AD
E
RROR
Major errors that prohibit the TS4000 from operating in a safe manner and
result in the unit going offline. The TS4000 will not inform the user of any
gas being present.
S
ENSOR
L
IFE
R
ESET
This bit informs the user that the Remaining Sensor Life Reset command
has been given by the BU and acknowledged by the IM.
B
ASE
S
ETUP
This bit informs the user that a magnet is accessing the setup “
SE
” menu
option on the BU.
5.9.3 Status / Error (0x0002)
A Read command returns the bit map for any Error that is presently occurring, with duration of
at least ten seconds. The duration requirement screens out transient and intermittent errors.
The following table shows the errors that are represented by each bit in the register.
Table 26: Base Unit Status Error Bitmap
Bit
4
3
2
1
Error
F3:
Base Unit
Rom Error
F2:
Calibrate
Timeout
F1:
No Sensor
Plugged
F0:
IM Offline
Error
Hex
Value
0x0008 0x0004 0x0002 0x0001
Dec
Value
8 4 2 1
Bit
8
7
6
5
Error
F7:
Base Unit
EEPROM Error
F6:
Voltage Low
F5:
Sensor Failure
F4:
Sensor Rate
of Change Error