Conel CDA 70, Руководство пользователя

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CDA70 MODEM DESCRIPTION
10
2.5.1.
Connection of PORT1, PORT2 and PORT3 connectors (RS232)
(RS232 – DCE – Data Communication Equipment)
Pin
number
Signal
mark
Description Data flow direction
1 RTS Request To Send Input
2 CTS Clear To Send Output
3 DTR Data Terminal Ready Input
4 DSR Data Set Ready - connected to +12V through 560
Ohm resistor Output
5 GND GROUND - signal ground
6 RXD Receive Data Output
7 CD Carrier Detect Output
8 TXD Transmit Data Input
Circuit example of the meter with modem CDA70:
Circuit example of the PC with
modem CDA70
:
•
the cable KD2 is connected to serial PC port (example COM1)
Circuit example of the RS232 equipment with
modem CDA70
:
Modem CDA70
Cable KD-2
PWR
CIO
PORT3
PORT2
PORT1 ETH
Modem CDA70
PWR
CIO
PORT3
PORT2
PORT1 ETH
Cable KD-2
Pin 1 – RTS
Pin 2 – CTS
Pin 3 – DTR
Pin 4 – DSR
Pin 5 – GND
Pin 6 – RXD
Pin 7 – CD
Pin 8 – TXD
Modem CDA70
Meter