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Main PCB
J1 and J2 - Sense Jumpers
If sense leads are NOT used, you must install plug-in jumpers at J1 and J2 (adjacent to the P1
connector). These jumpers attach the sense leads to the excitation leads. If sense leads ARE
used, these plug-in jumpers should be positioned on one plug-in pin only or removed and
stored for later use. Refer to Figure No. 5 for the location of the jumpers.
J3 - Dead Load Boost Jumper
For very low dead loads (less than 10% of the combined load cell capacity) connect the dead
load boost jumper J3 on the printed circuit board. Refer to Figure No. 5 for jumper location.
NOTE! Remove the left end cap to access the jumpers. Refer to Figure No. 9.
SERIAL INTERFACE SPECIFICATIONS
Your Model 204 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 GROUND (GND)
The 204 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, 19.2K and 38.4K baud.
• The data format is fixed at 8 bits, No parity, and 1 stop bit.
• The indicator is shipped from the factory with the baud rate set to 9600 baud.
INSTALLATION, Cont.
Figure No. 5 - Main PCB
7
5
4
3
2
9
8
7
Figure No. 6
1
6
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