Baker Hughes Apollo 3, User Manual

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Copyright 2020 Baker Hughes Company. All rights reserved. Page 38 of 277
Table 12: Power Connections
Position Connection Sub-System I/O Bus
0 System Power (+24V) +24 Vdc
1 System Power (0V) GND
2 Ground
3 Ground
4 Field Power (0V) External 24V Supply
– GND
5 Field Power (0V) External 24V Supply
– GND
6
Field Power (+24V) External 24V Supply ±24V
7
Field Power (+24V) External 24V Supply ±24V
Communication Connections:
Communication Connections Apollo communicates with the RSTi I/O using the Sub-System
communication port (COM3) which can be shared with the Apollo I/O board.
Table 13: Communication Connections
Position
Connection Sub-System I/O Bus
1 (Top) Data + A
2 Data - B
3
Ground/Signal Common GND
4 Shield SHIELD
5 (Bottom) Field Ground
Sensor Types:
The RSTi I/O is compatible with Platinum PT-100 RTDs.
If RSTi analog input modules are used, they need to be connected to the Modbus
Network Adapter before all other modules.
Figure 9: ST-3704 Interface Design, page 39 shows the interface design for ST-3704.