Tecomat Foxtrot – system design
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MR-0104 - interface RS-232, with galvanic isolation
The MR-0104 submodule is used for the transmission of the TTL signals of the serial interface to the RS-
232 interface, including galvanic isolation. This interfaces is designed only for the connections of two
participants (point-to-point connection). It can be advantageously used for example to realize a
connection of a TECOMAT PLC with a PC for short distances (to 15 metres). The galvanic isolation of the
serial interface is ensured by a built-in converter and no external power supply is required. Detailed
information on the submodule, its internal connection and setup are described in the documentation TXV
101 04.
Table 1.1.3.1 Terminal board C connection of serial channel CH2 with fitted submodule MR-0104
Terminal board C
Terminal
Signal
Type of signal
Used as
C1
+ 5V
power supply output
C2
GND
signal ground
C3
RTS
output
control signal 1)
C5
CTS
input
control signal 1)
C7
RxD
input
data signal
C1
C2
C3
C4
C5
C6
C7
C8
C9
+
5
V
CH2 OPTIONAL SUBMODULE (e.g. RS-232, RS-485)
+
5
V
G
N
D
G
N
D
R
T
S
B
T
-
-
B
T
+
C
T
S
T
x
R
x
-
-
T
x
R
x
+
R
x
D
-
T
x
D
T
x
R
x
-
-
T
x
R
x
+
C8
TxD
output
data signal
1) The use of the signal is described in the manual Serial communication of Tecomat programmable
controllers TXV 001 06. The quiescent state of the signal corresponds to log. 1.
MR-0114 - interface RS-485, with galvanic isolation
The MR-0114 submodule is used for the transmission of the TTL signals of the serial interface to the RS-
485 interface with galvanic isolation. This interface works in the semi-duplex mode and allows multidrop
interconnection of participants. For proper functioning, the communication line has to be terminated
correctly (see the following paragraphs). The galvanic isolation of the serial interface is ensured by a built-
in converter and no external power supply is required. Detailed information on the submodule, its internal
connection and setup are described in the documentation TXV 101 04.
Table 1.1.3.2 Terminal board C connection of serial channel CH2 with fitted submodule MR-0114
Terminal board C
Terminal Signal
Type of signal
Used as
C1
+ 5V
power supply output
C2
GND
power supply
signal ground
C3
BT–
– output of termination
RS-485 bus termination
C4
BT+
+ output of termination
RS-485 bus termination
C5, C8
TxRx–
– input/output of RS-485 data signal
C1
C2
C3
C4
C5
C6
C7
C8
C9
+
5
V
CH2 OPTIONAL SUBMODULE (e.g. RS-232, RS-485)
+
5
V
G
N
D
G
N
D
R
T
S
B
T
-
-
B
T
+
C
T
S
T
x
R
x
-
-
T
x
R
x
+
R
x
D
-
T
x
D
T
x
R
x
-
-
T
x
R
x
+
C6, C9
TxRx+
+ input/output of RS-485 data signal
MR-0124 - interface RS-422, with galvanic isolation
The MR-0124 is used for the transmission of the TTL signals of the serial interface to the RS-422 with
galvanic isolation. The interface allows the connection of two co-operating devices (point-point). Each line
(RxD as well as TxD) has to be terminated at the line end by terminators 120 Ohm.
The galvanic isolation of the serial interface is ensured by a built-in converter and no external power
supply is required. Detailed information on the submodule, its internal connection and setup are described
in the documentation TXV 101 04.
Table 1.1.3.3 Terminal board C connection of serial channel with fitted submodule MR-0124
Terminal board C
Terminal Signal
Type of signal
Used as
C1
+5V
power supply output
+5V
C2
GND
signal ground
C3
CTS–
input
control signal
1)
C4
CTS+
input
control signal
1)
C5
RxD–
input
data signal
C6
RxD+
input
data signal
C8
TxD–
output
data signal
C9
TxD+
output
data signal
C1
C2
C3
C4
C5
C6
C7
C8
C9
+
5
V
CH2 OPTIONAL SUBMODULE (e.g. RS-232, RS-485)
+
5
V
G
N
D
G
N
D
R
T
S
B
T
-
-
B
T
+
C
T
S
T
x
R
x
-
-
T
x
R
x
+
R
x
D
-
T
x
D
T
x
R
x
-
-
T
x
R
x
+
1)
The use of the signal is described in the manual Serial communication of Tecomat programmable
controllers TXV 001 06. The quiescent state of the signal corresponds to log. 1.
