EF-Series Instruction Manual
Rev 2/01 3-3
3.3.1 EIA-232 Serial Communications Card
The EIA-232 communications card meets all EIA-232 specifications for single-ended, RS-232
asynchronous data transmission over distances of up to 50 feet. Refer to Figure 3-1. The EIA-232
communications card provides transmit, receive, and modem control signals. Normally, not all of the
control signals are used for any single application.
This is the standard communications card for the host port of the EF-series Unit. The EIA-232
communication card’s P1 connector plugs into the Main Electronics Board at P3 and activates Comm1.
The RTS and DTR control lines are supported. The EIA-232 communications card defaults are: 9600
baud rate, 8 data bits, 1 stop bit, no parity, 10 millisecond Key-On Delay, and 10 millisecond Key-Off
Delay. If you need to change any of these default values, use the ROCLINK software. The maximum
baud rate allowed by the software is 19.2k.
The EIA-232 communications card includes LED indicators that display the status of the RXD, TXD,
DTR, DCD, and RTS signal/control lines. LED indicators are detailed in Table 3-1.
DOC0274A
Figure 3-1. EIA-232 Serial Communications Card
Power Control
Host Port (Comm1)
Terminals
Mating Connector
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