C
ONVERTER
RS-232, RS-422, RS-485
O
PERATION
M
ANUAL
IOA55-1c
August
2009
12
The converter should be connected with a cat. 5 twisted wire, of which the impedance of
twisted wire pairs is 120
Ω
. The maximum wire length to meet the requirements is
1200 m.
However, it is not advisable to use such long connections. The length of a twisted wire should
be limited in favour of the length of an optic-fibre wire.
Figure 8. Power supply joint
To connect the power supply we use two upper triple-contact sections of the connector
in figure 8. In order to connect it, you should put the cable of the isolated power supply feeder
or battery in the connector and screw its screws tight. Power supply polarization is any. There
should be ground added to the connector in output 3 (first from the bottom).
2.1.2. TR-55.2
The device is equipped with the screw connector intended any signal and power wire.
Optic-fibre wire should be connected by the agency of SC-type connectors (double, single for
final converter version and two double or single ones for intermediate converter version).
1 2 3 4 5 6 7 8 9
Figure 9. Pin numbering of the screw connector
The
screw connector of the
TR-55.2
converter is adjusted for connecting to the serial
computer port of the RS-232 standard or any other device equipped with a port of the RS-232,
RS-422, RS-485 standards as well as power voltage 6-60 VDC. The view of this connector is
shown in figure 7. Table 1 shows description of specific outputs.
Table 2. Specific pins description of the screw connector
Function
Pin number of screw
connector
RS-232
RS-422
RS-485
1
TxD +
D +
2
TxD
TxD -
D -
3 RxD
RxD
+
4
RxD -
5 GND
6
SHIELD
7
8
6-60 VDC
9 Ground
