5
INSTALLATION
PRINT *
TARE *
1 5 V dc (5 mA max.)
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 in the diagram. Momentary
contact switches must be used.
Field: T CR LF
Length: 1 1 1
TARE COMMAND
RS232 INTERFACE
ANALYTICAL
Plus balances are equipped with a bi-directional RS232 compatible interface
for communication with printers and computers. When the balance is connected directly to
a printer, displayed data can be output 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.
The following sections describe the hardware and software provided with the balance.
Hardware
On the rear of the balance, a 9-pin subminia-
ture “D” connector is provided for interfacing to
other devices. The pinout and pin connections
are shown in the adjacent illustration.
The balance will not output any data unless pin
5 (CTS) is held in an ON state (+3 to +15 V dc).
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; 3) Sending a print command
(“P”) from a computer.
The output format is illustrated in the RS232
command table which follows.
RS232 Commands
All communication is accomplished using stan-
dard ASCII format. Only the characters shown
in the following table are acknowledged by the
balance. Any other commands, control char-
acters or spaces are ignored. Commands sent
to the balance must be terminated with a
carriage return (CR) or carriage return-line line
feed (CRLF). For example, a tare command
should appear as shown in the adjacent dia-
gram. Data output by the balance is always
terminated with a carriage return - line feed
(CRLF).
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