USRobotics V.34 - Manual (Page 228)

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