Rear Panel Switch And Connector Descriptions - Racal Instruments 1269 User Manual

1269 User Manual
Rear Panel Switch
and Connector
Descriptions
Switch Reference
FAN FULL/3-
QUARTER SPEED
(NON EMS UNITS
FAN SPEED
CONTROL ENABLE
(EMS ONLY)
LOGICAL ADDRESS
(EMS ONLY)
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Table 3-2, Rear Panel Switches
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.
ONLY)
Fan Speed Control.
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.
VXI Logical Address Switch. Refer to Chapter 2
Enhanced Monitor VXI Logical Address Switch.
Table 3-3, J412 EMS RS-232 Port
Pin
2
3
5
1,4,6,7,8,9
Description
This switch enables fan
Signal Description
TXDA Transmit Data
RXDA Received Data
GND Logic Ground
RSV Reserved
Operating The 1269 3-7