1269 User Manual
Operating The 1269 3-7
Rear Panel Switch
and Connector
Descriptions
Table 3-2, Rear Panel Switches
Switch Reference
Description
FAN FULL/3-
QUARTER SPEED
(NON EMS UNITS
ONLY)
This switch allows fans to run at 3/4 speed on
units not equipped with the EMS option. Refer to
Chapter 2, Fan Speed (HI-LO) Selection.
FAN SPEED
CONTROL ENABLE
(EMS ONLY)
Fan Speed Control. This switch enables fan
speed control when set to the
VAR
(Variable)
position. Set this switch to
MAX
to run the fan at
full speed regardless of HI or LO jumper setting on
EMS See
Fan Speed (HI-LO) Selection - EMS
Figure 2-14.
In the
VAR
position the monitoring
system automatically controls the speed of the
fans depending on the air temperature and the
amount of cooling required by the modules.
LOGICAL ADDRESS
(EMS ONLY)
VXI Logical Address Switch. Refer to
Chapter 2
Enhanced Monitor VXI Logical Address Switch.
Table 3-3, J412 EMS RS-232 Port
Pin
Signal
Description
2
TXDA
Transmit Data
3
RXDA
Received Data
5
GND
Logic Ground
1,4,6,7,8,9
RSV
Reserved
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