Keri Systems LC-208 Proximity Elevator Control - Manual (Page 10)

Proximity Elevator Control Panel
1530 Old Oakland Road, Suite 100 01879-001 Rev. E
San Jose, CA 95112 USA
(800) 260-5265 (408) 451-2520 FAX (408) 441-0309
Web: http://www.kerisys.com E-mail: [email protected]
Page 10 of 22
Quick Start Guide
LC-202P/LC-208P
Figure 5: 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 4,000 feet. Make the RS-485 network
connections per the information in Table 3 and Figure 6 on page 11.
NOTE: Do NOT connect earth ground to the RS-485 network cable shield. The LC-200P 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