Choosing the right protocol stack for an open and flexible remote unit

Abstract

Abstract-This paper presents some works made in the development of communications software for an embedded open core system. By using a Linux-based processor implemented on a FPGA, we are developing the appropriate software in order to implement a remote unit to be used in a telecontrol network. We present an analysis of the physical devices needed and a performance report of them. After that, we analyze the requirements of the telecontrol network and the possibility of reusing already implemented protocols in Linux instead of using standard telecontrol protocols.

Open and Flexible Embedded System Applied to Positioning and Telecontrol

“…Another problem is that there are some transmission channels that cannot work with the TCP/IP stack [12], no web service could be used, and the development of a specific protocol is required [13]. Therefore, the IEC protocol is an option because it has a data link layer protocol.…”

“…In the IEC standard, there are predefined ASDUs for different kinds of parameters (e.g., analog counter, digital counter, sensor measurement, etc.). The second answer is that there are some transmission channels that cannot work with the TCP/IP stack, as justified in [12], and require the development of specific protocol, as explained in [13]. The last answer is that with the IEC standard, the RTU can be applied to applications other than positioning, for instance, a typical RTU in a power utility.…”

“…As OFESAPO, in its first application, is intended to be used in surveillance applications, like forest fire fight, only the following mobile communication technologies have been considered, as justified in [12]. Both GSM and GPRS are used, where a cellular telephony operator has range.…”

Using Internet Protocols to Implement IEC 60870-5 Telecontrol Functions

“…The program corresponding to the CC will operate in a PC, while the one corresponding to the RTU will run in an RTU implemented in an embedded system [27], [28]. This system is based on an open core hardware in which Linux has already been installed.…”

The IEC-60870-5 standard for a personal server applied to telemedicine

“…As justified in [9] when the transmission channel is half-duplex, RF, it is necessary to use a protocol that controls …”