Keri Systems LC-508 Proximity Elevator Control - Manual (Page 11)

Proximity Elevator Control Panel
2305 Bering Drive 01941-001 Rev. B
San Jose, CA 95131 USA
(800) 260-5265 (408) 435-8400 FAX (408) 577-1792
Web: www.kerisys.com E-mail: [email protected]
Page 11 of 22
LC-502P/LC-508P
Quick S
tart Guide
Figure 6: Floor Control Relay Connection
5.2.2 RS-485 Controller Network
All of the controllers in the elevator network communicate through an RS-485 serial
communication network. Per the RS-485 industry specification, this network must be daisy-
chained, with a total network cable length of no more than 16,000 feet. Make the RS-485 network
connections per the information in Table 3 and Figure 7 on page 12.
NOTE: Connect shield ground at the master controller ONLY. The LC-500P controller
automatically connects earth ground to the shield at one point on the network. This single
connection minimizes the effects of ground loops that can affect controller performance.
Table 3: RS-485 Controller Network
TB-1 Pin Description
1 Tx/Rx Negative
2 Tx/Rx Positive
3 Network Cable Shield Ground