OHAUS TROOPER SCALE, Service Manual

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4-13
CHAPTER 4 MAINTENANCE PROCEDURES
4.2.8 RS232 Interface Test
The RS232 Interface in the Trooper scale can have its performance monitored using an external printer
or computer connected to the scale.
The RS232 Interface is a bi-directional interface which enables the scale to communicate with a printer
or computer equipped with an RS232 serial port. An Print menu is in the scale. This menu enables
various parameters such as Baud rate, Data bits, Stop Bits and Parity to be set in the scale.
The Print menu provides communication parameters which can be set to accommodate external
printers or computers. It contains eight submenus: Reset, Baud Rate, Parity Bit, Data Bits, Stop Bits,
Auto Print, Interval, Stable, and save settings which enable you to program RS232 port parameters.
Refer to Print menu and make sure all communications parameters are properly set.
4.2.8.1 Connecting the RS232 Interface
When the interface is connected to a computer, two way communication between the computer and
scale is possible using the commands outlined in the RS232 Command Table 4-4. See Figure 4-7 for
connections. When the scale is connected directly to a printer, displayed data can be output at any time
by simply pressing PRINT
UNITS.
Figure 4-7. RS232 Interface Pin Connections.
1
2
Data Out (TXD)
3 Data In (RXD)
4
5
Ground
6
7
8
9
1 2 3 4 5
6 7 8 9