PACSystems VersaMax Genius Network Interface User Manual Section 2
GFK-1535D Jan 2023
Installation 41
2.11.2 Bus Length
The maximum bus length for shielded, twisted-pair cable is 7500 feet.
Some cable types are restricted to shorter bus lengths. In turn, the bus
length determines which baud rate may be selected. Refer to Section
2.9.1, Selecting a Baud Rate.
2.12 Making Bus Connections
The NIU has two bus connectors. The upper connector is for the main bus
cable; it is always used. The lower connector is for an optional redundant
bus cable. The NIU has a built-in bus-switching capability. In a dual-bus
installation, do not attach a separate bus-switching device to the NIU.
(The NIU can be located on a bus stub downstream of a bus-switching
device, however).
The maximum exposed length of unshielded wires should be 5cm (2in).
For protection, each shield drain wire should be insulated with spaghetti
tubing to keep the Shield In and Shield Out wires from touching each
other or the signal wires.
Figure 32: Bus Connections
1.
Connect Serial 1 to the Serial 1 terminals of the previous and next
devices.
2.
Connect Serial 2 to the Serial 2 terminals of the previous and next
devices.
3.
Connect Shield In to Shield Out of the preceding device. Connect
Shield Out to Shield In of the next device. If the NIU is the first
device on a bus, Shield In can be left unconnected. If it is the last
device on a bus, Shield Out can be left unconnected.
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