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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

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 145 146

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