YOKOGAWA AQ7260 OTDR, User Manual, Page: 381 / 442

Chapter 8 USING OPTIONS AND EXTERNAL DEVICES
8-30
Service Request function
When the service request is valid, the service request signal is transmitted according
to the table below.
Bit Explanation
D8 Always
：
0
D7 Service request (0:None / 1: exist)
D6 Hardware information (0: normal / 1: abnormal)
D5 Always
：
0
D4 Always
：
0
D3 Plug check information (0: normal / 1: abnormal)
D2 Command check (0: Normal / 1: error)
D1 Status of instrument (0: On measurement / 1: No
measurement)
Control command and sent data format
Several control command can be sent in connected form by using “,” for connection.
However, the receive buffer capacity of this equipment is 512 bytes.