Toshiba GR-200 Series Instruction Manual page 550

with a shielded-twisted-pair cable. The terminal arrangement and references are shown
below. The cable sheath should be connected with the case frame ground (FG). To use a
shielded-twisted-pair cable, the total length should be less than 1200 meter (0.75 miles); the
terminal resistor (150 ohms) should be connected when any connector is not connected. See
Communication protocol: RS485 communication
Chapter
849).
Top
PCB connector
A1
A2
A3
Bottom
a. View from connector edge
Figure 5.5-4 RS485 connection and module
Fiber optic
Fiber optical module is used for the serial communication in IEC 60870-5-103 standard.
B1
COM-A(+)
B2
COM-B(−)
B3
COMM(GND)
0V
b. Port circuit
- 531 -
for the setting parameters (→p.
A3
B3
A2
B2
A1
B1
Frame ground (FG)
6F2T0200 (0.15)
Sheath
A cable for
an IED
Sheath
A cable for
another
IED
GRE200 (1,2)