Black Box IC109A-R2 Manual de instalación Pagina 78

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© 2007 Schneider Electric. All Rights Reserved.
1
63230-216-229-B1
Installation
Communications Wiring
Biasing the Communications Link
To ensure reliable communications, you must bias the POWERLOGIC
communications link (if biasing is not in the system master nor an interfacing
RS232/485 converter). Use a Multipoint Communications Adapter (MCA-485)
biasing device. Place the adapter between the first device on the link and the
communications port of the PC. The illustration below shows installation of the
adapter when the first device on the link is a Sepam™ Series 80 relay.
One set of biasing resistors is required per daisy chain. On the Black Box converter
IC109A-R2, these can be activated by a switch. Other converters should be checked
for configurable biasing. Biasing is recommended at or near the system master.
TX–
TX+
RX–
RX+
SHLD
21
20
22
23
24
IN+
SHLD
OUT–
OUT+
IN–
Green
Shield
Black
Red
White
To Next
POWERLOGIC
Device
5-Position
Terminal Block
To Comm Port
of Converter
without Biasing
Provisions
DB9
Female
DB9
Male
DB9
Female
RS-485
Terminals
C
To Port C
on Sepam 1000+
ACE959
Communications
Interface
Connecting a Sepam Series 80 as the first device on a POWERLOGIC daisy chain using CAB107 cable, MCA-485, and terminal block
CAB-107
Belden 8723
MCA-485
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