Service manual

Appendix B - Hardware Specifications and Cabling 107
Cyclades-TS Installation & Service Manual
Cabling Information Applicable only to the TS100
The RS-485 Standard
The RS-485 is another standard for serial communication and is available only in the Cyclades-TS100. Different
from the RS-232, the RS-485 uses fewer wires - either two wires (one twisted pair) for half duplex communication
or four wires (two twisted pairs) for full duplex communication. Another RS-485 characteristic is the “termination”.
In a network that uses the RS-485 standard, the equipments are connected one to the other in a cascade
arrangement. A “termination” is required from the last equipment to set the end of this network.
TS100 Connectors
Although the RS-485 can be provided in different kinds of connectors, the Cyclades-TS100 uses a 9-pin D-
shaped connector (DB-9) and a block connector with the pin assignment described below.
RS-485
Signal
Name/Function DB-9 pins Block
connector
pins
Chassis Safety Ground 1
TXD- Transmit Data - (A) 7 2
TXD+ Transmit Data + (B) 3 3
RXD+ Receive Data + (B) 2 4
RXD- Receive Data - (A) 8 5
Chassis Safety Ground 6
Notice that if the Cyclades-TS100 is configured to use RS-485, the RS-485 signals will be available in both DB-