SB-30/70/150 Operation Manual
3
Installation and Wiring
The scale’s back panel comes equipped with
a female DSUB-9 connector for the RS-232
serial port, a jack for DC power input, a cali-
bration switch, a remote display connector
(SB-30 & SB-70 only) and an ON/OFF rocker
switch. To install the scale, simply plug the
enclosed AC Wall Adapter into the scale’s DC
power jack first, then into an AC outlet (115
VAC only). For SB-30 and SB-70 scales, plug
in the remote display/keyboard unit. Finally,
turn the rocker switch to the ON (“1”) position.
The scale is now ready for use.
ON/OFF
SWITCH
DC POWER
JACK
RS-232
PORT
REMOTE
DISPLAY
ID TAG
CALIBRATION
SWITCH COVER
(SB-30 & 70 ONLY)
CONNECTOR
SB-30/70/150 Back Panel
The female 9-Pin RS-232
connector is used to interface
to a PC. Shown at right are
the pin assignments for the
connector.
Pin No.
Pin Name
2
Receive Data
3
Transmit Data
5
Signal Ground
2
3
5
9-pin RS-232 connector (female)
Shown at right is the suggested cable diagram
for direct connection to a PC. Or, you can order
the optional pre-wired NMC-1 Null Modem Ca-
ble
TO SCALE
TO PC
2
RXD
RXD 2
TXD
3
S. GND
5
3
TXD
5
S. GND
6
DSR
4
DTR
8
CTS
DSUB9
DSUB9
FIGURE 1. Cable Diagram for Scale to IBM PC
