ABB RELION REX640 Technical Manual page 98

Section 3
Basic functions
92
• 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 22: Connector X8 signals
Pin No Pin name
1 GND
2 GNDC
3 NC
4 IRIG-B -
5 IRIG-B +
6 ISOL_GND
7 RS485 B1/-
8 RS485 A1/+
9 RS485 B2/-
10 RS485 A2/+
9
10
7
8
5
6
3
4
1
2
GUID-3638E235-AB2E-4571-B1EE-DF76AEA0FC36 V1 EN
Figure 14: X8 connector pinout
Table 23: LED configuration (COM1004...COM1005)
LED
X1
X2
X6
X7 TX
Table continues on next page
Description Alternative
EARTH
GND connected to
earth via 1nF capacitor
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
Description
X1 LANA
X2 LANB
X6 LD
FO-UART
1MRS759142 C
REX640
Technical Manual