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Data Bits
Note d
Communicating
Over the.
RS-232C Bus
(HP 9000
Series 200/300
Controller)
Programming Over RS-232C
Data bits are the number of bits sent and received per character that
represent the binary code of that character. Characters consist of either 7
or 8 bits, depending on the application. The HP 1652B/53B supports 8 bit
only.
8 Bit Mode. Information is usually stored in bytes (8 bits at a time). With
need to convert the data.
The controller and the HP 1652B/53B must be in the same bit mode to
properly communicate over the RS-232C. This means that both the
controller and the HP 1652B/53B must have the capability to send and
receive 8 bit data.
For more information on the RS-232C interface, refer to the
HP 1652BlHP 1653B Front-Panel Reference
RS-232C voltage levels and connector pinouts, refer to the
Service Manual.
Each RS-232C interface card has its own interface select code. This code
is used by the controller to direct commands and communications to the
proper interface by specifying the correct interface code for the device
address.
Generally, the interface select code can be any decimal value between 0
and 31, except for those interface codes which are reserved by the
controller for internal peripherals and other internal interfaces. This
information, refer to the reference manual for your interface card or
controller.
For example, if your RS-232C interface select code is 9, the device
address required to communicate over the RS-232C bus is 9.
Manual. For information on
HP 165281538
HP 16528/l 6538
Programming Reference
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