SMAR LC700 - Technical Specifications

LC700 – User’s Guide
3.106
Connectors
There are two connectors on the front panel to interconnect two communication systems. The first,
an RJ12 type connector is used for the RS232 systems and the other, a terminal block type
connector is used for the RS485 systems
.
RJ12 Pin Assignment
Pin Numbe
r
Description
1
Connected to 6 pin.
2
Not used
3
RxD: EIA-232 input signal - reception
4
TxD: EIA-232 output signal - transmission
5
GND: EIA-232 signal ground
6
Connected to pin 1
NOTE
Pins 1 and 6 are interconnected to allow the handshaking between the modem signals when
required by communication drivers, such as Clear-To-Send (CTS) with Request-To-Send (RTS)
interconnection.
Pin Block Terminal
Pin Number Description
1
+: EIA-485 Non inverting signal
2
-: EIa-485 Inverting Signal
3
GND: Reference for EIa-485 Communication Signal.
NOTE
The GND pin is used to set up a voltage reference for all EIA-485 nodes, on the same bus. The
EIA-485 side of EIA-232/EIA-485 Interface is isolated and is left in a floating state. To avoid
undesirable high common mode voltage it is recommended to make all of the EIA-485 nodes on
the same voltage reference by connecting all GND pins and grounding at just one point.
Technical Specifications
Number of Communication Channels
1
Data Communication Interface
EIA-232 / EIA-485
Baud rate
Up to 200 KBPS enable
EIA-232 side
Enables EIA-232 Half-Duplex or Full-Duplex mode
EIA-485 side
Enables Embedded Bus Terminator activation
Protection EIA-485
No transmission when the bus is in break state
Isolation
1600 V
RMS
@1 minute, typical
Power Supply
Provided by the IMB bus, +5 Vdc, @ 100 mA Typical
Note
In the interconnection of the 485 network, to attend the EMC standard (Electromagnetic capability),
it is necessary to use a three way shielded twisted pair cable. Where, two ways are used to
communication and the third is used as reference. The shielding must be connected in one of the
housing endings."