Siemens SIMATIC TIWAY 1 Bedienungsanleitung PDF herunterladen (Seite 22)

Network Design Considerations

2-5

TIWAY 1 Ti505 NIM User Manual

2.2.2 RS-232-C

iming Considerations

you use the TI505 NIM

with a dedicated short-haul RF modem, the NIM has a one-sec

ond

time-out between the transmission of its RS-232-C Request to Send (RTS) and the

RS-232-C

Clear to Send (CTS) response.

This

time-out value is set at one second to enable the RF device to switch from receive to

transmit

without losing access to the transmission media.

NOTE

This

extended time-out feature is an important consideration when se

lecting a TIWAY I-compatible RF Modem. Transmitter/Receiver turn-

around

time must be less than the one second network time-out.

additional half-second delay from Clear to Send (CTS) to start of transmission can be

added

by setting the Keydelay Switch to the open position. (Chapter 3 provides addition

information concerning dipswitch settings.) This may be required to allow the trans

mitter

to reach full power before start of transmission. There is also a one-second wait

period for DCD to turn off in a half duplex modem.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 117 118

Keine Kommentare

Siemens SIMATIC TIWAY 1 Bedienungsanleitung Seite 22