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I/O SERIAL DATA OPERATIONS
RS-232 Pin Description

Fire Controlman Volume 03-Digital Data Systems
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transmitted over the I/O channel control lines and used to synchronism the message transfer, or the message itself may be preceded and succeeded by a string of special  synchronization  (sync)  characters.  The  sync characters allow the receiving device to frame and receive the message data. Messages preceded by sync pulses   are   followed   by   one   or   more   special synchronization (sync) characters to indicate the end of a particular bit stream. Often several different types of messages are sent over the same channel. The message contents   identify   the   type   of   message   and   the destination (addressed peripheral). DCE/DTE Serial I/O Cable Signals With  serial  operations,  one  cable  will  suffice  to perform serial I/O operations with an external device. Each of the signal leads is assigned a specific function. These functions can be assigned one of four specific groupings: data (both primary and secondary), control (again,  both  primary  and  secondary),  timing,  and ground. Each of these groupings is indicated by a letter in figure 7-25 and is further described in the legend. We use an RS-232 as our example in this discussion. Although  the  connector  itself  is  not  specified  in  the standard, a 25-pin connector (such as the one shown in figure  7-25)  has  become  the  generally  accepted Figure 7-25.—A typical RS-232 female connector. 7-29






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