10
RS-232 INTERFACE: The UPM-DT-1 and UPM-DT-10
Ultrasound Power Meters are equipped with a bi-
directional RS-232 compatible interface for communica-
tion with printers and computers. When the balance is
connected directly to a printer, displayed data can be out-
put at any time by simply pressing PRINT or by using the
Auto Print feature. Connecting the balance to a computer
enables you to operate the balance from the computer, as
well as receive data such as displayed weight, weighing
mode, stability status, etc.
Hardware: On the rear of the balance, the right hand 9-
pin male subminiature “D” connector is provided for inter-
facing to other devices. The balance will not output any
data unless pin 5 (CTS) is held in an ON state (+3 to +15
VDC). Interfaces not utilizing the CTS handshake may tie
pin 5 to pin 6 to defeat it.
Output Formats: Data output can be initiated in one of
three ways: 1) by pressing PRINT; 2) using the Auto
Print feature or 3) sending a print command (“P”) from a
computer.
Default Settings: Baud-2400; Data bits-7; Parity-None;
Stop bits-2; Lock-Off.
RS-232 Commands: All communication is accomplished
by standard ASCII format. Characters shown in the fol-
lowing table are acknowledged by the balance. Invalid
command response “ES” error indicates the balance has
not recognized the command. Commands sent to the
power meter must be terminated with a carriage return-
line feed (CRFL).
SERIAL COMPUTER/PRINTER INTERFACE
1. N/C
2. Data Out (TXD)
3. Data In (RXD)
4. Tare (External Signal)*
5. Clear to Send (CTS)
6. Data Terminal Ready (DTR)
7. Ground
8. Request to Send (RTS)
9. Print (External Signal)*
* External PRINT and/or TARE switches may be installed as shown. Momen-
tary contact switches must be used.
IMPORTANT!
An Ohaus RS-232 cable is required to enable the balance to communicate with a com-
puter or printer; a standard RS-232 cable will not work. The cable can be ordered from
Ohmic or directly from Ohaus (www.ohaus.com). Cable part numbers are as follows:
25-pin: #AS017-02;
9-pin: #AS017-09.
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