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Это шина CAN. 11. CAN box
11.1 Components
According to different signal the system has three types of module, type A, B, and C. So there are three types of CAN box (node box). CAN box type A is used to process electric signal of 4~20mA, e.g. hook weight and standpipe pressure; it is also called CAN analog module box. Type B is used to process pulse signals, e.g. RPM and SPM and it is call CAN SPM module box. Type C is used to judge pulse direction and count pulse, e.g. hook position and depth; it is also called CAN depth module box.
All box is composed of a circuit board, two bus sockets, a signal input socket and a bus box.
11.2 Description of components
11.2.1 Circuit board
1) XS1 is the signal input socket on circuit board and is connected to signal input socket on bus box.
2) XS2 is bus input/output socket on circuit board and is connected to bus socket on bus box.
11.2.2 Selection switch of bus node address
In bus analog module box, 1-7 positions of D2 (8-position toggle switch) are used to select node address of 128 in total. Detail definition is shown below:
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