US Robotics COURIER Uživatelský manuál stáhnout pdf (Strana 188)

U.S. Robotics I-modem Command Reference

Analog Synchronous Applications • Page 16-3

Transmit and Receive synchronous timing pins are required at the EIA-232 interface. Pins

15 and 17 are required: The I-modem transmits timing signals through pin 15 and receives

timing signals through pin 17.

Communications Software

The devices at both ends of the link must use the same synchronous protocol.

Ask your network administrator about the software support (for example, a speciÞc com-

munications package) that you need to log into the network.

Synchronous Operations

During synchronous operations, transmit and receive clocks at both ends of the phone link

control the precise timing of the data ßow. The communications equipment at the remote

device and the I-modem and computer must all handle the data at the same speed.

The I-modem is always the source of the transmit clock timing signals and sends them to

your computer over the EIA-232 interface. Your computerÕs rate will follow the connec-

tion rates.

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US Robotics COURIER Uživatelský manuál Strana 188