Installation Instruction

Ref : SCT TMO MOD SPEC 662
Rev.: B
Ref. sec. :
Date:
18/11/2004
Document
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MO2XX module – Confidential under NDA
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When the UART of the MO2XX doesn't detect any activity on the RX input during a certain time, it allows
the MO2XX to switch off the UART when it wants. The DTE doesn't know when the MO2XX switches its
UART off.
If the DTE sends data to the MO2XX when the UART is off, the first character will wake up the DCE and
the first byte may be lost. Another way for the DTE to wake up the MO2XX is to put down its DTR or RTS.
1.2 Inhibition by DTE.
It is the same management as in 1.1 except that as long as the DTE has its DTR active, the MO2XX is
not allowed to switch off the UART anymore.
1.3 Hardware management.
This management uses signals to inform each equipment of the state of the other one. Signals are also
used to request a change of state of the other.
This methods allows to achieve a lower power consumption of the device by switching off the interface
modules as often as possible (i.e. when no communication is needed).
1.3.1. Signals.
There are 5 outputs and 4 inputs used to control the different states:
Output: MOD_ON_STATE, DTE_RESET*_CMD, MOD_UART_STATE, MOD_FLOW_STATE and
MOD_RESET_STATE.
Inputs: MOD_ON*_CMD, MOD_RESET*_CMD, DTE_UART*_STATE, MOD_OFF*_CMD.
As for now, the DTE_RESET*_CMD is not actually controlled by the MO2XX. It is just provided as a
spare in case the DTE needs a reset command from the DCE (very unlikely).
MOD_ON_STATE
MOD_UART_STATE
MOD_FLOW_STATE
MOD_RESET_STATE
MOD_OFF*_CMD
DTE_UART*_STATE
MOD_RESET*_CMD
MOD_ON*_CMD
RX
TX
DTE_RESET*_CMD
MO2xx
DTE
MOD_ON_STATE is active when the MO2XX is ON.
MOD_UART_STATE is inactive when the MO2XX is in deep sleep.