Salter Brecknell WB-521 Series - Manual (Page 11)

SBI521 Service Manual 9
Loadcell Jumper
Set JP3 jumpers for either a 4-wire or 6-wire loadcell.
Table 1.2 Loadcell Jumper Connector(JP3)
1.4.2 RS-232 Serial Port Connections
The SBI-521 indicator comes standard with two full Bi-directional RS-232 serial ports
designed for connection to either a PC or a serial printer.
Connect the serial printer or computer to the RS-232 terminal on the main board.
Communication terminal connections are shown in
Figure 1.4 . Refer to Table 1.10 and
Table 1.11 on page 12 for COM2 jumpers..
Figure 1.4 RS-232 Connector
Table 1.3 RS-232 Port Connections
Connected Pins Function
4 wire loadcell is used
6 wire loadcell is used
Designation Description Pin Electrical Level
RX1 port 1 receive 1 -12 to +12 VDC
TX1 port 1 transmit 2 -12 to +12 VDC
GND ground/common 3 0 VDC
GND ground/common 4 0 VDC
RX2 port 2 receive 5 -12 to +12 VDC
TX2 port 2 transmit 6 -12 to +12 VDC
1
6 TX2
RX2
GND
GND
TX1
RX1