Installation Instruction

Ref : SCT TMO MOD SPEC 662
Rev.: B
Ref. sec. :
Date:
18/11/2004
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1.3.3.4.2. Initiated by DCE.
MOD_ON_CMD
MOD_OFF_CMD
DTE_UART_STATE
MOD_RESET_CMD
MOD_UART_STATE
MOD_ON_STATE
MOD_FLOW_STATE
RX
TX
D
C
E
i
n
p
u
t
s
D
C
E
o
u
t
p
u
t
s
MOD_RESET_STATE
UART is OFF
state 3
state 2
This transition show 2 transitory states.
During transitory states 2 and 3, the DCE can't send data:
•
If it has to during state 2 it must put MOD_FLOW_STATE up (cf. 2.2.3.3.4.3.a) to wake up the
DTE.
•
If it has to during state 3 it has to wait for the falling edge of DTE_UART_STATE and then it is
state 2.
During transitory state 3, the DCE can receive data and the DTE can send data: there's no problem
for DTE to emit.
During transitory state 2, the DTE can't send data and the DCE can receive data. So if the DTE
wants to emit, it has just to put DTE_UART_STATE up (cf. 2.2.3.3.4.3.b).
The state 2 can be long.