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Chapter 3. Communications Operations of BHT-5000
3.2 Basic Communications Specifica-
tions and Parameters
3.2.1 Basic Communications Specifications
Listed below are the communications specifications when the BHT-5000 transacts data
with a host computer through the CU-5000 (optical interface) or direct-connect inter-
face cable.
Synchronization
Start-stop
Transmission Speed
300, 600, 1200, 2400, 4800, 9600, 19200, or 38400 bps
Transmission Code
JIS 7-bit/8-bit codes
Transmission Bit Order
LSB (Least significant bit) first
Response Method
ACK/NAK response
Vertical Parity
Even, odd, or none
Transparency
Non-transparent mode
RS/CS Control
Enabled or disabled
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Synchronization
For accurate data transaction, it is very important to synchronize the transmission
between the sender and receiver. To do this, it is required to previously define the
bit order and position, the character length, and the beginning and end of the
character to be transmitted.
The start-stop synchronization is an asynchronous system which synchronizes
each character as a unit; that is, it externally adds start and stop bits to the leading
and trailing bit positions of the character to be transmitted, respectively. A clock
starts counting on receiving the start bit and it falls into a non-communication state
on receiving the stop bit. The number of the stop bits is selectable (1 or 2 bits).
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Transmission Speed
Maximum number of bits to be transmitted per second. Expressed in bps (bits per
second).
