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
Page 64/67
ANNEX 3 : Data/Command hardware multiplexing
1. Hardware multiplexing
1.1. External interfaces
In the first set (hardware MUX), we need to use two hardware signals (MOD_ESCAPE*_CMD and
DTE_ESCAPE_CMD) and the full serial link V24.
In the second set, we only need to use the full V24.
To make an interface with a host, the MO2xx hardware multiplexing signals need no added hardware.
1.2. Capability requirements
1.2.1. Logical and electrical levels
Signal Logical levels Electrical levels
Active High level
MO2xx output DTE_ESCAPE_CMD
Inactive Low level
Active Low level
MO2xx input MOD_ESCAPE*_CMD
Inactive High level
1.2.2. Hardware protocol
SET_2 :
We switch between DATA and
COMMAND
MUX
V24
reception
emission
COMMAND
DATA
Hardware management:
DTE_ESCAPE_CMD and
MOD_ESCAPE_CMD
Software management:
Escape strings detection
In the paragraphs below only the
logical signals
are considered