9
2.2.3
Mounting
The modem is implied to be mounted on a DIN rail. Also it can be attached to a wall using the
bracket provided. To install the bracket, please unscrew the two screws that fix the DIN rail fastener.
Then use the same screws to secure the bracket.
To connect to the optical port, please use SC type fiber-optic connectors. To provide the minimum
loss of optical signal, UPC polished connectors (SC/UPC) are advised. Also SC/PC and SC/SPC
connectors can be in use.
Do not use SC/APC connectors
.
When delivered, the optical port of the modem is protected with a rubber plug to prevent dust.
Remove this plug only after installation has been completed, immediately when you are going to connect
optical connectors.
While connecting the fiber-optic link to the modem, please avoid excessive bending of the fiber-
optic cable. Overbends (kinking) can cause degradation of the signal or even full loss (backreflection) of
it.
It is acceptable to use mounting enclosures (cabinets, boxes, etc.). If the modem and any other
unit are arranged adjacently then vertical and horizontal distances between them shall be at least 10
mm each.
2.2.4
Wiring
Table 2.2.4.1 describes terminals of the blocks XT1, XT2.
Table 2.2.4.1
Terminal
Marking
Purpose
XT1
1
RS232 TxD
RS-232 Transmit Data
2
RS232 RxD
RS-232 Receive Data
3
RS232 GND
0V
4
RS485 TR+
RS-485 Line A
5
RS485 TR-
RS-485 Line B
6
RS485H TR+
RS-485 Line A / RS-422 Transmit Data «+»
7
RS485H TR-
RS-485 Line B / RS-422 Transmit Data «-»
8
RS485H TR+
RS-485 Line A / RS-422 Receive Data «+»
9
RS485H TR-
RS-485 Line B / RS-422 Receive Data «-»
XT2
1
VCC+
Power ”+”
2
VCC-
Power 0V
Terminals 6, 7, 8, 9 of the XT2 block can be used for communication over the RS-422
interface or two RS-485 interface lines.
Figure 2.2.3 shows a diagram for using the modems to extend Orion ISS RS-485 interface
line. Second and third RS-485 interface lines (terminals 6, 7, 8, 9) are connected similarly to the first
interface line (terminals 4, 5).
