THOMSON CIM 3.0, Руководство пользователя

Страница: 52 / 81

SECTION 2 THS 2000 SOFTWARE PROGRAM
PM055 Rev 2 00/08/31 Thomson Technology
46
An RS-232 to RS-422 converter is required to convert the signal from the computer or modem.
The required wiring from the RS-422 side of the convert to the RJ-45 connection on the
controller is as shown:
TDB(+)
TDA(-)
RDA(-)
RDB(+)
RS-232
GND
RS-422
Converter
1
2
3
4
5
6
7
8
RJ-45
To modem or
computer
To Controller
unused
The RS-232 NULL connection between the modem and the converter must pass all handshake
signals, as shown in the following diagram:
TD
RD
RTS
CTS
DSR
CD
DTR
GND
TD
RD
RTS
CTS
DSR
CD
DTR
GND
3
2
7
8
6
1
4
5 3
2
7
8
6
1
4
5
Signal/Pin Pin/Signal
DB-9
TD
RD
RTS
CTS
DSR
CD
DTR
GND
TD
RD
RTS
CTS
DSR
CD
DTR
GND
Signal/Pin Pin/Signal
DB-25
2
3
4
5
6
8
20
7
2
3
4
5
6
8
20
7
The modem must store configuration in a non-volatile storage medium (such as FLASH). The
modem must be configured for the following features:
•
auto-answer,
•
connect at 4800 bps only (no fallback),
•
echo disabled,
•
no error correction,
•
no compression.