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3.4 COMMUNICATION PORT See for connections PAGE 24, 26, 28
RS 232V24 / CL : The way of connection of the connection cable on the data in/output connector
and switch 65/66 determine the transmission mode: Current Loop or V24.
See print layout and connections on page 24
The CL is opto coupled, 20 mA, shortcut proof full floating.
V24 receipt is passive, buffered up to 85 V, sending is active en buffered.
Visual transmission check : Just above the output part and the input part of the data connector red led’s
indicate the correct connection of the port. Blinking of a led indicates an actual
transmission or receipt of data. Blinking is good visible at 1200 Bd.
Test comport (switch 67) : A slide switch (with white handle), at the right side above the data connector,
switches off the external connections and connects the 348’s in- and output
on line with one another.
If the 348 is set on continuous transmission mode (= call number 0), both the
led’s will blink synchronously (visible at 1200 Bd: switch 57 and 58 off).
Baud rate : Settings available 1200, 2400, 9600 and19,200 Bd, advised speed: 19,200 Bd
Transmission mode : If set as device nr. 0 , a 348 sends continuously max. 36 x per second a string.
The number of strings per second depends on the Baud rate setting, see
table 4 on page 42.
If set as device nr. 1 - 15, a 348 responds on a request with one string only
after at least 2 µsec up to max 27.5 msec.
Requests at continuous mode : Default transmission is the gross weight string, until a tare operation has been
executed. After taring automatically the net weight string will be sent.
If, in continuous sending mode, a setpoint value is requested, the data string
with setpoint info will be sent one time only. Thereafter the original
transmission will be continued.
Slow down transmission speed : The speed of transmission at continuous mode may be delayed to max
1,1 string per second, by sending the command ! E A CR, see page 38, 42.
Character frame : 1 start bit, 7 data bits, 1 parity bit (odd/even) 2 stop bits,
Asynchron ASCII with always CR as last character, see table 4 on page 42.
Device (call) number : Setting with switch 61 up to 64 from nr. 0 up to 16. The 348 responds only on
requests and commands with its call number in front. See table 5 on page 43.
Bus mode, interface 848 : Using the 848 interface up to 15 x 348’s may be connected in Current Loop.
The output of the 848 interface may be selected as CL or RS232 V24.
See also chapter 8 on page 28, 29.
Manual 348-2 V 3.1 Page 12 01-06-2007
12


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