Topic 2 - IEEE 802 & RS232/RS422
1) research the IEEE 802 working groups. list each group with abrief description and state whether it is active or not.
2) research the following standards and for each standard, briefly describe the devices to which it relates.
-RS232
-RS422
answer
1)
ACTIVE WORKING
802.1 High Level Interface (HILI)
802.3 CSMA/CD Working
802.11 Wireless LAN (WLAN)
802.15 Wireless Personal Area Network (WPAN)
802.16 Broadband Wireless Access (BBWA)
802.17 Resilient Packet Ring (RPR)
802.18 Radio Regulatory Technical Advisory
802.19 Coexistence Technical Advisory
802.20 Mobile Wireless Access
802.21 Media Independent Handover
HIBERNATING WORKING GROUPS
802.2 Logical Link Control (LLC)
802.5 Token Ring
802.12 Demand Priority
DISBANDED WORKING GROUPS
802.4 Token Bus
802.6 Metropolitan Area Network (MAN)
802.7 BroadBand Technical Adv. Group (BBTAG)
802.8 Fiber Optics Technical Adv. Group (FOTAG)
802.9 Integrated Services LAN (ISLAN)
802.10 Standard for Interoperable LAN Security (SILS)
802.14 Cable-TV Based Broadband Communication Network
reference : Grouper.ieee.org. (2017). [online] Available at: http://grouper.ieee.org/groups/802/802%20overview.pdf [Accessed 12 Apr. 2017].
2)
RS-232 (ANSI/EIA-232 Standard) is the serial connection historically found on IBM-compatible PCs. It is used for many purposes, such as connecting a mouse, printer, or modem, as well as industrial instrumentation. Because of improvements in line drivers and cables, applications often increase the performance of RS-232 beyond the distance and speed listed in the standard. RS-232 is limited to point-to-point connections between PC serial ports and devices. RS-232 hardware can be used for serial communication up to distances of 50 feet.
| Data | |
| TXD (pin 3) | Serial Data Output |
| RXD (pin 2) | Serial Data Input |
| Handshake | |
| RTS (pin 7) | Request to Send |
| CTS (pin 8) | Clear to Send |
| DSR (pin 6) | Data Set Ready |
| DCD (pin 1) | Data Carrier Detect |
| DTR (pin 4) | Data Terminal Ready |
| Ground | |
| GND (pin 5) | Ground |
| Other | |
| RI (pin 9) | Ring Indicator |
Table 1: Pin Functions for RS-232
RS-422 (EIA RS-422-A Standard) is the serial connection historically used on Apple Macintosh computers. RS-422 uses a differential electrical signal, as opposed to unbalanced signals referenced to ground with the RS-232. Differential transmission uses two lines each for transmit and receive signals which results in greater noise immunity and longer distances as compared to the RS-232. These advantages make RS-422 a better fit for industrial applications.
| Data | |
| TXD+ (pin 8) | Serial Data Output (differential) |
| TXD- (pin 9) | Serial Data Output(differential) |
| RXD+ (pin 4) | Serial Data Input(differential) |
| RXD- (pin 5) | Serial Data Input(differential) |
| Handshake | |
| RTS+ (pin 3) | Request to Send (differential) |
| RTS- (pin 7) | Request to Send (differential) |
| CTS+ (pin 2) | Clear to Send (differential) |
| CTS- (pin 6) | Clear to Send (differential) |
| DSR (pin 6) | Data Set Ready |
| Ground | |
| GND (pin 1) | Ground |
Table 2: Pin Functions for RS-485 and RS-422
reference:
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