MODGAS-XWR-1 Technical Guide
LCD DISPLAY SCREENS
23
Main Screens Map and MODGAS Screens
Main MODGAS Screens
Refer to the following map when navigating through the Main Screens.
From the MGAS XWR Screen, press
<ENTER>
to scroll through the
screens.
MGAS XWR
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Control State
CONTROL STATE
This screen displays the Communications Control State of the MOD-
GAS-XWR Controller. The Control States are:
AUTO_STAND_ALONE:
: This is the automatic stand-alone mode
that the board moves into on startup. While in this mode, the Controller
listens on the E-BUS and I2C communication lines. If communication
is detected from either communication form, the Controller moves into
the corresponding state (E-BUS or I2C). In the AUTO_STAND_ALONE
mode, a supply air temperature sensor is connected to the board.
COMM_E-BUS:
After startup, if there are requests via E-BUS for data,
then the Controller moves from STAND_ALONE into COMM_E-BUS. In
this mode, the Controller continually accepts communication via E-BUS
to obtain status information and setpoints (e.g. supply air temperature
and supply air temperature setpoint). It will not move out of this mode
without specifi c confi guration changes or a power cycle.
COMM_I2C:
After startup, if there are requests via I2C for data, then
the Controller moves from STAND_ALONE into I2C_MODE. In this
mode, the Controller continually accepts communication via I2C to ob-
tain status information and setpoints. It will not move out of this mode
without specifi c confi guration changes or a power cycle.
COMM_TIMEOUT:
If there is a loss of communication for either E-
BUS (master or slave) or I2C, the Controller moves into this mode. This
state re-initializes communications and then puts the Controller into
COMM_RECOVER mode. Normal board operations do not continue
when in this mode (e.g. you cannot go into Heat mode).
COMM_RECOVER:
After the Controller moves into COMM_TIME-
OUT, the Controller is then put into this mode. The Controller will not
leave this mode until E-BUS or I2C communication returns. Normal Con-
troller operations do not continue when in this mode (e.g. you cannot go
into Heat mode). If communication resumes, the Controller moves into
the previous communication state.
FORCED_STAND_ALONE:
In this mode, the Controller acts as a
Modbus master communicating to either another MODGAS-XWR Con-
troller or a 12 Relay Controller for additional fi xed stages. The only way
to leave this control state is to change the “S/A MODE” confi guration
from “FORCED” to “AUTO” in the Confi guration screens.
SLAVE_MODE:
If the Controller is acting as a Modbus slave to an-
other MODGAS-XWR Controller, then it operates in this control state.
This mode limits many Controller operations (e.g. the PID Loop does not
run in this mode). In this mode, the board essentially mimics the opera-
tion of the MASTER Modgas XWR board.
CONFIG
MENU
EXIT
MENU
Protected Screens Map
Refer to the following map when navigating through the LCD Protected
Screens. From the MGAS XWR Screen, press the
<ENTER>
twice
until you get to the SOFTWARE Screen. Then hold the
<UP>
button
for 5 seconds and then release the
<UP>
button to have the Confi gura-
tion Menu appear. To scroll through the rest of the screens, press the
<MENU>
button.
Software
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Hold for 5 seconds and then release.
MGAS XWR
1086vXXX
S/A Mode
