Electronics TSP - 3 Manual De Instrucciones página 17

ASCII ENCODED ASYNCHRONOUS DATA TRANSFER FORMAT
Theory of operation:
When the SMOD pin is connected to ground and the data request input signal (SREQ\) is activated low an
ASCII data transmission at 2400 baud is issued. Each reading consists of 14 characters in length with each
character being 10 bits long (1 start bit, 7 data bits, 2 stop bits and no parity).
PROTOCOL
1 start bit
7 bits ASCII character
no parity bit
2 stop bits
2400 baud
TIMING INFORMATION
Bit Transfer Rate:
Reading Transfer Rate:
one ASCII character
start d0 d1 d2 d3
The data transmission differs for English and Metric units. There are 7 digits that may be displayed with the
English system but only 6 digits are displayed with the metric system. Characters that are not used in the 14-
character string are transmitted as spaces.
EXAMPLE:
IM0060_sp
}
TOTAL OF
10 BITS
PER
CHARACTER
2400 bits / sec
7 readings / sec
d4 d5 d6 stop stop
10 bits long
inch units: -12.70000 in<cr,lf>
mm units: -322.580 mm<cr,lf>
Note: cr = carriage return (0Dh)
lf = line feed (0Ah)
16 of 19