Specifications

7SR242 Duobias Data Communications

Section 2: Physical Connection

The relay provides one ‘Front’ USB communication interface (Com2) located on the fascia and one RS485

(Com1) located on the ‘Rear’. Optional Fibre optic ports can also be located on the rear. Access to the

communication settings is only available from the relay front fascia via the COMMUNICATIONS MENU

1. Com2-USB: this port is used for IEC60870-5-103 (default setting) communication with Reydisp software.

MODBUS RTU or optional DNP3 are also available through Com 2.

An ASCII protocol, the main use of which is to allow firmware to be updated from the front connection, is

also available through this port.

2. Com1-RS485: this port can be used for IEC60870-5-103, MODBUS RTU or optionally DNP3

communications to a substation SCADA or integrated control system or engineer remote access.

3. Com3/Com4: Optional fibre optic ports located on the rear of the relay can be used for IEC60870-5-103,

MODBUS RTU or optional DNP3 communications to a substation SCADA or integrated control system or

engineer remote access.

SPDL can provide a range of interface devices, please refer to product portfolio catalogue.

Full details of the interface devices can be found by referring to the website