Physical Locations Of The Serial Channels - ABB RELION REX640 Technical Manual

1MRS759142 F
3.2.9 Assigning of a serial communication protocol to a COM
serial port
The settings of the serial communication protocol instance include a setting
parameter, called either
COM2 setting.
3.2.10

Physical locations of the serial channels

The physical location of the COM1 and COM2 drivers depends on the link mode
used which, in turn, depends on the used communication hardware option. Serial
channels can be found on communication boards COM1004...COM1005.
• X7 is the fiber-optic interface. Only driver COM2 can be configured into fiber-
optic mode.
• X8 is the RS-485/IRIG-B interface. Both drivers COM1 and COM2 can be
configured to this interface: COM1 and COM2 can act as two RS-485 2-wire links
or, alternatively, COM1 can act as one single RS-485 4-wire link. Both ports are
galvanically isolated serial communication ports.
Table 38: Connector X8 signals
Pin No
1
2
3
4
5
6
7
8
9
10
REX640
Technical Manual
Port or Serial port , which is used to select the COM1 or
Since not all serial protocol standards allow changes in link parameters,
all link setting parameters are not found in the COMn settings. Additional
link setting parameters are found in the setting parameter list of the
used serial protocol.
Pin name
GND
GNDC
NC
IRIG-B -
IRIG-B +
ISOL_GND
RS485 B1/-
RS485 A1/+
RS485 B2/-
RS485 A2/+
Description Alternative
EARTH
GND connected to
earth via 1nF capaci-
tor
ISOL2_GND
RS485 GND
2-wire - , COM1 4-wire TX pair, COM1
2-wire + , COM1 4-wire TX pair, COM1
2-wire - , COM2 4-wire RX pair, COM1
2-wire + , COM2 4-wire RX pair, COM1
Basic functions
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