User`s guide

80 DC 900-1339H

FMP Programmer’s Guide

4.11 Modem Control Option (16)

This option determines two things: the operation of the request to send (RTS) output

modem signal and the detection of the data set ready (DSR) and data carrier detect

(DCD) input modem signals. Table 4–2 lists the possible settings for this option.

To set this option using the DLI conﬁguration ﬁle, use the

modemControl parameter; for

example,

modemControl = “FDX1”. See Table 5–1 on page 104.

4.11.1 RTS Signal

When the modem control option is set to any half-duplex setting (HDX), the RTS signal

is turned on when FMP is ready to transmit and turned off when transmission is com-

plete. For any full-duplex setting (FDX), the RTS signal is turned on when the link is

started and stays on until the link is stopped. In all cases, transmission does not start

until a clear to send (CTS) signal is received by the FMP software.

Table 4–2: Modem Control Option Settings

Value Setting Description

0 HDX-1 Half duplex, detect DSR

1 FDX-1 Full duplex, detect DSR

2 HDX-2 Half duplex, ignore DSR and DCD

3 FDX-2 Full duplex, ignore DSR and DCD

4 HDX-3 Half duplex, detect DCD

5 FDX-3 Full duplex, detect DCD

6 HDX-4 Half duplex, detect DSR and DCD

7 FDX-4 Full duplex, detect DSR and DCD