Page 4.3
MEMS FIBER OPTIC SWITCH MODULE 40-855
pickering
SECTION 4 - PROGRAMMING GUIDE
MODULE ARCHITECTURE 40-855
The sub-units used to control the module’s MEMS relays are as detailed below. Enabling a particular bit opens the
corresponding Channel.
2 Channel Switch
The 40-855 Modules utilise either one or two MEMS switches depending on the option. In the default state Channel
1 is selected. Energising the MEMS switch appropriately creates a signal path between the Common and the other
Channel terminal. The relay module’s switching architectures are shown in their default state in the diagrams below:
Dual 2 Channel Switch
Sub-Unit
Bit
Bank
Signal Path
Board MEMS Relay:
40-855-012 etc
1
Default
1
Com to Channel 1 (Default)
SW2
1
Com to Channel 2 (Energised)
Table 4.1 - Single Fiber Optic Switch Module 40-855: Sub-Units
B
C
A
Normally
Closed
Normally
Open
B
C1
A
Normally
Closed
Normally
Open
B
C2
A
Normally
Closed
Normally
Open
Channel 1
Channel 2
Channel 1
Channel 2
Channel 1
Channel 2
Sub-Unit
Bit
Bank
Signal Path
Board MEMS Relay:
40-855-022/122
Board MEMS Relay:
40-855-222
1
Default
1
Com to Channel 1 (Default)
SW2
SW1
1
Com to Channel 2 (Energised)
Default
2
Com to Channel 1 (Default)
SW3
SW3
2
Com to Channel 2 (Energised)
Table 4.2 - Dual Fiber Optic Switch Module 40-855: Sub-Units
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