Teledyne 3220 - Multi-channel oxygen monitor system - Manual (Page 40)

5 Failure and Error Codes Model 3220
Teledyne Analytical Instruments 26
4.2.3 Fuses
For fuse replacement/installation, see sections 3.7.1 and 3.7.2
4.2.4 RS485 Port
NOTE: This feature is not presently supported—contact the factory for application
assistance.
An RS485 port is provided at the 9-pin D-sub connector. The RS485 port is connected
internally to all of the Channel Modules in the system.
Figure 4-1: RS-485 Port on Control Unit
4.3 Channel Module Front Panel Controls and Indicators
STANDBY Switch—When pressed, this membrane switch places the
Channel Module in the standby mode, i.e., removes power from the
sensor(s) and extinguishes the LCD display.
NOTE: If the relays are configured for fail-safe operation, they will remain energized. If an
alarm condition exists, the Channel Module will return to a non-alarm state.
RESET Switch—After an alarm condition is no longer present, as
indicated by the concentration value shown on the display, press this
membrane switch to return the relay or relays to the non-alarm (normal)
state.
BYPASS Switch—When in an alarm condition, pressing this membrane
switch disables the Control Unit audible alarm.
NOTE: The red, yellow and blue alarm LEDs begin to flash. They remain flashing until the
alarms are reset or the BYPASS switch is pressed again.