Toshiba GR200 Series Instruction Manual page 1067

Fiber optic module
6.
Fiber optic module is used for the serial communication in the IEC 60870-5-103 standard.
IRIG-B000 module
7.
IRIG-B000 module is used to receive the digital signal generated with an external clock; the
signal is in conformity to serial IRIG-B000 format. Note that the IRIG-B000 module is able to
receive digital signal (TTL) only (i.e., the reception of AM signal is not applicable). This module
is isolated using a photo coupler; the user should note A2 and B2 connectors are not used. The
peak value of IRIG-B000 signal should be greater than 3.5 volts; the IRIG-B000 module has
the input resistor (about 3k ohm). Thus, the terminal resistor can be required when the IRIG-
B000 signal is delivered for several devices; the value of the terminal resistor depends on the
number of deliveries and the performance of the external clocks. For setting of time
synchronization, see Chapter
C11
C12
Figure 5.3-9 Fiber optic module
Technical Description: Clock function
Top
PCB connector
A1
A2
A3
Bottom
a. View from connector edge
Figure 5.3-10 IRIG-B000 module
- 1044 -
A1
B1
B1
A2
(Disuse)
B2
B2
(Disuse)
B3
A3
B3
b. Port circuit
6F2S1914 (0.49)
.
SIG
GND
GRL200 (Soft 033 & 037)