Baker Hughes Apollo 3 - Communication Connections

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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.