Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 127)

Appendix C
Technical Description
C–4
4. Host Communications
Host communications are provided by either an RS-232 or RS-422 port.
There are two communication ports available. The ports provide:
•
EIA RS-232/CCITT V.24 Asynchronous ASCII on a standard 9 pin
male D-type connector.
•
EIA RS-422 on a 9 pin male D-type connector (Com1 port only).
•
Character type: 7 or 8 data bits.
•
Parity: Even, odd, none, zero, or mark.
•
Data Rate: 19,200, 9600, 4800, 2400, 1200, 600, 300, 150, or 75 baud.
•
XON/XOFF protocol used by default on RS-232 or RS-422 port.
•
ENQ or can be used in Host polling mode.
Note: Com2 (Aux Port) is RS-232 only.
5. Network
•
Requires no dedicated concentrator or controller.
•
Networking is included in each terminal.
•
Each workstation is always a full use workstation for data collection
and control as well as being a network element.
•
The network is a polled network.
•
Each station is addressable.
•
Fault tolerant architecture.
•
Network may be both local and remote.
•
Up to 1,024 workstations per network.