Usage Guide; Station Control; Entering A Logical Ring - Toshiba V Series User Manual

Chapter 6 Usage Guide
This chapter describes the system planning and program design considerations for
connecting a normal PC/AT compatible machine to the information control network TC-
net 100. Also described in this chapter is the procedure for using the support library
when actually using the JTNI card.
The notation TcnXxxxYyyy used in this chapter denotes the name of a support function.

6.1 Station Control

6.1.1

Entering a Logical Ring

TC-net 100 uses a transmission path access protocol referred to as DOMA (Deterministic
Ordered Multiple Access). With DOMA, transmission with other stations is performed by
entering a logical ring as with token passing protocol.
In order to enter a logical ring, you must set the scan transmission cycle with
TcnSccSetCycle. When you issue this function, a high-, middle-, or low-speed scan
transmission cycle is set and you are entered in a logical ring. When you reset the JTNI
card, you are removed from the logical ring. Therefore, you must issue TcnSccSetCycle
once more to enter the logical ring.
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