Converter Card Settings - Nemtek MERLIN STEALTH MASTER Installer Manual

MERLIN STEALTH MASTER

CONVERTER CARD SETTINGS

There are two converter cards available for the communication interface between the
energizers.
1) The Stealth RS 485 converter card.
The card converts RS485 to RS 232.
2) The Stealth Fibre Optic converter card.
This card converts:
a) RS 232 to fibre optics.
b) RS 485 to fibre optics.
The selection between a) or b) is made with a jumper (JP3) on the converter card.
Please note that a single card can not convert from fibre optics to RS 232 and
simultaneously convert to RS 485.
The converter cards have Jumpers (JP), which must be set correctly to make the network
operate properly.
THE STEALTH RS-485 CONVERTER CARD
This card has only one jumper (JP1) which is used to correctly terminate the impedance of
card and cable (twisted pair and earth-screen with a 120 Ohm characteristic impedance). For
this reason it must be inserted at the first and the last network component of the RS 485
system.
The jumper (JP1) must not be inserted on the converter cards which are connected between
the first and the last card.
THE STEALTH FIBRE OPTIC CONVERTER CARD
This card has three jumpers (JP1, JP2 and JP3).
JP1 is used on the card to repeat the optical signal i.e. anything received on the optical Rx
port is immediately transmitted on the Tx port. To prevent that a message is repeated
endlessly JP1 is never inserted on the Master controller. Jp1 is used normally on Slave units
in the Daisy chained systems.
Converter card settings
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