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USRobotics V.34 User Manual

Page 228

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COURIER HIGH SPEED MODEMS

K-4 Technical Specifications

DATA FORMAT

Binary, serial; defaults to 8-bit word length, no parity, and 1
stop bit

Word

Parity

Stop

Length

(1 Bit)

Bits

7

Even, Odd

1

Mark, Space

7

None

2

8

None

1

FRONT PANEL STATUS LIGHTS

HS

High Speed (above 2400 bps)

AA

Auto Answer/Answer

CD

Carrier Detect

OH

Off Hook

RD

Received Data

SD

Send Data

TR

Terminal Ready (DTR)

MR

Modem Ready/Test mode

RS

Request to Send

CS

Clear to Send

SYN Synchronous mode
ARQ/ Error control connection established

FAX Modem in Fax mode

FLOW CONTROL BUFFERS

Transmit Buffer

Error control: 3.25k bytes

Non-Error control: 1.5k bytes, 128-byte option

Receive Buffer: 2K bytes

COMMAND BUFFER

60 characters, exclusive of AT prefix, Carriage Return and
spaces