USRobotics V.34 User 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