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PC Board Layout
NOTE: P1, P2, P3, J2 and J3 are on solder side of board.
Serial I/0 Connection
Your Model 758 has a RS-232 serial port that may be connected to a printer to record weight and
associated data or it may be connected to a remote display (like the SB-80) or to a computer for
transmission of weight data. The weight data may be transmitted on demand (pressing the
PRINT key or on receipt of a command from the computer) or continuously. Figure No. 6 shows
the Serial I/0 connector along with the identity of the pins used.
PIN NO.
FUNCTION
2
DATA INPUT (RXD)
3
DATA OUTPUT (TXD)
5
SIGNAL GR OUND (GND)
7
REQUEST TO SEND (RTS)
8
CLEAR TO SEND (CTS)
SERIAL INTERFACE SPECIFICATIONS
The 758 RS-232 serial interface can be configured during the setup and calibration procedure or
during the setup review operation. Using either method, it is possible to select the operation of
the serial interface as well as select the baud rate.
The baud rates supported are: 1200, 2400, 4800, 9600 and 19.2K baud.
The data format is fixed at 8 bits, No parity, and 1 stop bit.
The indicators are shipped from the factory with the baud rate set to 9600 baud.
The serial interface can be configured to operate with a printer, remote display (SB-80) or a
computer. The mode of operation is made during the setup and calibration of the instrument.
Refer to the applicable section of this manual for detailed information.
When configured for a printer, weight data is sent when the PRINT key is pressed or the 758 can
send data on receipt of a command from the computer. If configured for a remote display, weight
data is sent continuously.
Figure No. 5 - Main PCB
5
SERIAL
4
5
3
9
8
7
Figure No. 6
2
2
1
6
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