IC Realtime Professional 3-D DVR/PTZ Keyboard with Network Capability - Manual (Page 22)

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Figure 5-3
One 485 bus can connect with thirty-two RS485->232 converters，one RS485->232 converter
can connect with twelve DVRs.
5.1.3 Multi-keyboard link via RS485
You can use the following figure if you are connecting multiple keyboards via RS485 port. See
Figure 5-4.
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Figure 5-4
Multi-converter connection：
The last converter on RS 485 port must be short circuited. (E.g.: open converter). See Figure 5-5.
See the image below, you need to change [1-2] short circuit to [2-3] short circuit.
Note:
Menu serial setup should conform to the device you connected; otherwise keyboard can not
control the device!
Figure 5-5
5.2 Network Connection (For network keyboard only)
Connect RJ45 port to the network to realize network control and upgrade.
Short circuit
1 2 3
A
B
Other 485 devices
485->232 converter 485->232 converter
A B
485->232 converter
…