- 4 -
3. INTRODUCTION, RS232 OR RS485 SERIAL INPUT TRANSMITTER
The LTS6 seri l input to n log output tr nsmitter (or serial-to-analog converter) acce ts
numeric readings embedded in streaming RS232 or RS485 ASCII serial data, and converts
these to an isolated, scalable 4-20 mA, 0-20 mA, 0-10V or -10V to +10V analog out ut. The
LTS6 utilizes an LT counter transmitter board, but no signal conditioner board. The unit fits on
a 35 mm DIN rail and is only 22.5 mm (0.89") thick. It is normally owered by AC (85-264 Vac),
but can o tionally be owered by low voltage AC or DC, such as 24 Vdc. All electrical
connections are via detachable screw-clam lugs.
The current or volt ge tr nsmitter output is jum er selectable and is transformer isolated to
avoid ground loo s. Either out ut rovides 16-bit resolution of the out ut s an and is ultra-
linear to within one bit. The out ut is scaled to the serial in ut in software. Out ut accuracy is
±0.02% of s an.
Du l solid st te rel ys rated 120 mA at 140 Vac or 180 Vdc are standard. The relays can
res ond to the transmitted serial values or to transmitted control characters, which override the
internal set oints. The relays can also be controlled inde endently of the serial in ut by
a lying signals to control in uts 1 and 2.
Isol tion to 250V rms is rovided for ower, the serial data in ut, analog out ut, and relay
out uts. Isolation adds safety and avoids ossible ground loo s.
Seri l d t input selections are RS232, half-du lex RS485, or full-du lex RS485. Selection is
via jum ers and/or at the connector.
Tr nsmitter setup is via the unit’s serial ort using an external PC and Instrument Setu
software, which can be downloaded from our website at no charge. The required 3-wire
transmitter-to-PC interface RS232 cable (CBL04) is easy to build and is also available for
urchase.
The LTS6 is not plug nd pl y. The format of the strings being received must be known in
advance, including non- rinting control characters. If you do not know the format of your ASCII
data, contact tech su ort of the manufacturer of the sending device. Or use a terminal
emulator PC rogram, like HyperTermin l or Re lTerm, to view the received data on your PC.
The LTSE6 Ethernet input to n log output tr nsmitter acce ts streaming Ethernet data and
converts it to an isolated, scalable 4-20 mA, 0-20 mA, 0-10V or -10V to +10V analog out ut.
That transmitter is covered by a se arate user manual.
