EN/07.2013/58/13
2.4. Communication
COM1: PRG SPI COM2: COM0:
SLAVE USER
SPI synchronous serial interface
X24 allows the plug-in of a serial interface board, such as ACTHKEY (hardware key for software up/download).
COM1: PRG asynchronous serial interface
The connector X22 allows the plug-in of an IS232 (connector for program loading) or an IS485 (adapter to allow the
connection of C2020 to RS485 serial line) interface board for communication with a Tele-control gateway and other
serial devices.
COM0 – COM2: USER and SLAVE serial interfaces
There are two telephone connectors (RJ-12) on board: X20 for connection to the user interface (COM0) and X21 for
connection to a remote slave controller (COM2).
A pin-to-pin telephone cable must be used for connection to USER and SLAVE ports. Over 5 m length, screened cables
must be used.
Name Logic ID Signal type Terminals Features - description
USER
(COM0)
- - X20-1 Not connected
TX+ + RS485 X20-2 Line + RS485
TX- - RS485 X20-3 Line – RS485
GND Ground X20-4 Ground
+V V not adjusted X20-5 12V voltage supply
- X20-6 Not connected
SLAVE
(COM2)
- - X21-1 Not connected
TX+ + RS485 X21-2 Line + RS485
TX- - RS485 X21-3 Line – RS485
GND Ground X21-4 Ground
- - X21-5 Not connected
- - X21-6 Not connected
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