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1MRS 750107-MUM
5.
5.1.
5.2.
5.2.1.
ABB Automation
Serial LonTalk™ Adapter
Technical Reference Manual
Interfaces
General
The SLTA option card has 5 separate interfaces:
- a 64-pin E1 card connector for connection to the mother board of the
RER 111 unit
- a fibre-optic transceiver pair
- a 9-pin D-type female connector for the RS232 interface
- a service switch
- a 40-position SIMM connector for the LTS-20 core module.
RS232 interface
Specification
The RS232 interface is a 9-pin D-type female connector. This connector can be
wired as a 3-wire interface for the connection to a host or as an 8-wire interface when
it is used in conjunction with a modem.
Table 5.2.1-1
The pin designations for the RS232 interface
Pin
Signal in DCE mode
1
DCD OUT
2
TXD
3
RXD
4
DTR IN
5
GND
6
DSR OUT
7
RTS IN
8
CTS OUT
9
RIOUT
Communication cables for use with SLTA option card can be ordered separately.
For ordering information, see chapter 9.
The RS232 communication cable has to be shielded. The length of the serial
communication cable is limited to max. 12 m.
It is recommended to connect the shield to ground in one end of the cable. However,
depending on the specific case and the surroundings, the cable may need more than
one earth connection. In such a case the other earth connections should be made
through a capacitor.
To connect the protective shield, note the following instruction. The protective
shield is designed to be connected to the casing of the D-type connector, which has
to be made of conductive material. The connector of the option card is earthed to the
case of the RER 111 unit.
The figure 5.2.1.-1 illustrates the connection of the protective shield to the cable
connector.
Signal in DTE mode
DCD IN
RXD
TXD
DTR OUT
GND
DSR IN
RTS OUT
CTS IN
RIIN
SLTA Option Card
Description
Data Carrier detect
Data I/O
Data I/O
Data Terminal Ready
Signal Ground
Data Set Ready
Request To Send
Clear To Send
Ring Indicator
9
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