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7 Data Communication via RS-232- and USB-B interface
7.1 General Information
The burette TitroLine® 5000 has two serial RS-232-C interfaces to communicate data with other
devices. By means of these two interfaces it is possible to operate several devices on one computer
(PC) interface.
In addition to that, the TitroLine® 5000 also has an alternatively USB-B interface, which can only be
used to connect a PC.
RS-232-C-1 establishes the connection to a connected computer or to the previous device of the
“Daisy Chain“. At the RS-232-C-2 it is possible to connect additional devices (Daisy Chain Concept).
PIN assignment of the RS-232-C interfaces:
7.2 Chaining multiple devices
—“Daisy Chain Concept“
In order to activate several devices in a chain individually, each device must have an own device
address. For this it is at first necessary to establish a connection from the computer to the RS-232-C
interface 1 of the first devise in the chain by means of a RS-232-C data cable, e.g. Type No. TZ 3097.
With the additional RS-232-C data cable, Type No. TZ 3094, the RS-232-C- interface 2 of the first
device is connected with the RS-232-C-interface 1 of the second device. At interface 2 of the second
device it is possible to connect an additional device.
The TitroLine® 5000 can also be connected via USB cable TZ 3840 (type A (M)
– type B (M), 1.8m). It
is also possible to connect the TitroLine® 5000 via USB cable TZ 3887 (type A (M) --- USB type B
(Mini), 2.0 m) to a USB interface of a PC. To accomplish this connection, a USB driver has to be
installed on the PC. Then the USB-B interface takes over the function of the RS232-1 interface. The
USB driver can be downloaded from our website.
The address always consists of two characters: e.g. address 1 of the two ASCII- characters <0> and
<1>. The addresses can be set from
00
to
15
, i.e. 16 possibilities. It must be ensured that the devices
in a chain have different addresses. If a device is addressed with its address, this device will process
this command without sending it to another device. The reply to the computer has also an own
address. The addresses are allocated as described in
Chapter 5.3
.
The burette TitroLine® 5000 receives commands from a PC at the interface
1
(USB- B) if the
computer knows the address. It also sends the answer via this interface. If the address of the incoming
command does not match the device address, the complete command will be forwarded to interface
2
.
Interface 2 is connected to interface 1 of another device. This device checks the address as well and
reacts to the command as the first TitroLine® 5000 did before.
All information (data strings) which arrive at interface 2 of the burette TitroLine® 5000 will immediately
be send to the computer via interface 1 (or USB-B interface). Thus, the computer receives the data of
all devices. In practice it is possible to connect up to 16 devices to one computer- (PC-) interface.
PIN-No. Meaning / Description
1
T x D Data output
2
R x D Data input
3
Digital mass
