October
15
2009
–
Installation
Guide
Draft
–
Edit
Purposes
Only
Page
25
Installation Guide – October 2009 – Edit Purposes Only
2009
Figure 2-2 Example RS-485 System Diagram
Installation of locks and access controllers should be completed according to their
respective manufacturers' specifications and in accordance with all local codes. Final
connections to the device are explained in more detail in Chapter 4.
To avoid externally generated transients, do not run any wires near utility AC power
wiring, lightning rod grounding wire, etc. Grounding equipment is required for ESD
protection and safety.
2.1.6 CHOOSE NETWORK TYPE
If your installation requires the use of network communications, then the choice of
cable, the cable run length, the network topology, and the termination of the network are
important aspects that must be considered. The V-Station 4G and V-Flex 4G devices
can be networked using RS-232, RS-485, or Ethernet protocols.
The table below outlines relevant parameters of the RS-485, RS-232, and 100 baseT
Ethernet communication protocols.
Table 2-1 Communications Network Comparison
Spec
RS-485
RS-232
100BaseT
Mode of
Operation
Differential DC
Coupled
Single-ended DC
Coupled
Multi
DC Isolation
No
No
No
Maximum
Distance
4000 feet
150 feet
330 feet
