ROC364 Instruction Manual
4-2 Communications Cards Rev Jun/05
4.2.1 EIA-232 (RS-232) Serial Communications Card
The EIA-232 (RS-232) communications cards meet all EIA-232 (RS-232) specifications for single-
ended, asynchronous data transmission over distances of up to 15.24 meters (50 feet). The EIA-232 (RS-
232) communications cards provide transmit, receive, and modem control signals. Normally, not all of
the control signals are used for any single application.
Figure 4-1. EIA-232 (RS-232) Serial Communications Card
The current EIA-232 (RS-232) communications card includes LED indicators that display the status of
the RXD, TXD, DTR, DCD, CTS, and RTS control lines. LED indicators are detailed in Table 4-1.
Refer to Section 4.4.1, EIA-232 (RS-232) Communications Card Wiring, on page 4-13.
LED Indicators
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