Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation User Manual
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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.
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EIA RS-422 on a 9 pin male D-type connector (Com1 port only).
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Character type: 7 or 8 data bits.
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Parity: Even, odd, none, zero, or mark.
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Data Rate: 19,200, 9600, 4800, 2400, 1200, 600, 300, 150, or 75 baud.
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XON/XOFF protocol used by default on RS-232 or RS-422 port.
•
ENQ or <CR> can be used in Host polling mode.
Note: Com2 (Aux Port) is RS-232 only.
5. Network
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Requires no dedicated concentrator or controller.
•
Networking is included in each terminal.
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Each workstation is always a full use workstation for data collection
and control as well as being a network element.
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The network is a polled network.
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Each station is addressable.
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Fault tolerant architecture.
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Network may be both local and remote.
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Up to 1,024 workstations per network.