Bently Nevada 3300/01 Series, Operation Manual

Page: 31 / 78

System Monitor
80175-01
13 I SERIAL INTERFACE SETUP
JUMPER SETTINGS
Several j u m p e r s a r e l o c a t e d o n t h e S e r i a l
Interface option
PWA. Use the figure at the right
to help determine the required jumper settings for
your configuration. T h e W 4 / W 5 combination
allows the shorting together o f digital common
and isolated ground. These two ground systems
should b e connected together o n any interface
that uses the RS-232C standard. They should be
disconnected on all interfaces that use RS-422A
to t h e h o s t o r next rack. N o t e that t h e Serial
from IGND). The first rack in a daisy chain should
short W 4 i f the connection t o t h e host i s RS-
232C. Short W5 if the connection to the host is
- N T . L ALIOVE SETTIW; , ; ; ; ; w! i0
_L.
I
W4[
„,
L/5
DCOM I S I S O L AT E D F R O M ! G N D
`,FT T H I S C O N F I N N R AT I O N w H F N N S I N T
RS- 2 3 2 T O H O S T ' , E T C I I I Y 7 1 k - , 1
PACK I N D A I S - ( C!•+AIII
54 SHOFW-, DCOM l j I G N D
SET T H I S C O N F I G U R AT I O N O N A L L R A c K S
WHEN U S I N G R S - 4 2 2 T O H O S T
w 6 r 7 n 2 w , S E T T H I S C O N F I G U R AT I O N O N A L L B U T
„ 0 3 L : J / 7 7 1 w. ) T H E L A S T R A C K I N A D A I S Y C H A I N
Interface allows a selection o f RS-232C o r RS-
, 0 7 , - / - q [ = j S F ; T . H S C o N F I O U R AT I O N o N THE L A 5 1
422A t o the host but is always RS-422A t o the I w8E.:s.c; R A C K OR IF ONLY ONE RACK
next rack. Therefore, all interconnected racks past L
the first rack in a daisy chain should have the i
SET T H I S C O N F I G U R AT I O N O N A L L B U T
shorting b a r s e t o n W5, (DCOM disconnected w i e r 1.77M 4 "
w ! T r . - J F ! , 3 T H E F I R S T R A C K I N A D A I S , C H A I N
RS-422A.
wi0E2T-Tjw,, S E T THIS coNriouRATION ON THE
w 1 2 , - . 7 7 , 1 - - l w. , F I R S T R A C K i F U S I N G R S - 2 3 2 i F
The jumpers W6 through W13 are used to terminate unused RS-422A receivers. This is necessary
to prevent noise, coupled in the cable o r picked up on the connector inputs, from causing level
transitions in the interface. All unused RS-422A receivers should be terminated. Be sure to examine
your interconnections carefully. After terminating a receiver, make sure it is never again connected
through a cable to a driver in another daisy chained interface. Overheating and damage to the driver
will occur. As a precaution, remove
all terminating jumpers when changing the cabling configuration
of an existing system. When finished, reset termination jumpers.
W4 - Connects digital common to isolated ground
W5 - Disconnects digital common from isolated ground
W6,W8 - Terminates RS-422A receivers from next rack
W7,W9 - Unterminates RS-422A receivers from next rack
W10,W12 - Terminates RS-422A receivers from host
W11,W13 - Unterminates RS-422A receivers from host
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