Holland Electronics NE 1101L - Manual (Page 6)

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Forward Optical Receiver Operation Manual
same type of connector.
RF Output RF signal Output Port; 75
Ω F type female connector
Dummy Hole Dummy: Not used in this type
RS-485Interface Pin Definition
This RS-485 is full duplex type, so master and slave pin assignment is not the same. The connector definition
should be as following.
Master：(PC side)
1、 Receive+
2、 Receive-
3、 Transmit-
4、 Transmit+
Slave：(TX side)
1、 Transmit+
2、 Transmit-
3、 Receive-
4、 Receive+
Please make sure AC power is off when replacing new fuse.