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Signal name
Signal Ground
Transmitted Data
Received Data
Request To Send
Clear To Send
Data Set Ready
Data Terminal Ready
Data Carrier Detect
3.2
Two Modems interconnection
For the duplex operation, two current loops - transmitting and receiving - are used
to interconnect the converters. To each loop, the twisted pair should be applied to
limit the radiation and particularly the disturbance from outside. Each loop
connects one transmitter to one receiver and has to contain a power supply. The
transmitter or receiver supplies this power most often, it is so-called active
transmitter or receiver whereas the passive receiver is a consumer and the passive
transmitter is a current switch that supplies the active equivalent.
The converters´ operation mode implies the way of their connection. There are
three modes selected via the contacts on the DB9M link connector:
1) The active transmitter and receiver
2) The passive transmitter and receiver
3) The active transmitter and passive receiver
abbrev
DB9 Female
(DCE)
SG
5
TxD
3
RxD
2
RTS
7
CTS
8
DSR
6
DTR
4
DCD
1
4
trans.direction
DTE
converter
--
--
output
input
input
output
output
input
input
output
input
output
output
input
input
output
ELOE00XZKE001
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