Comtech EF Data DT-4500 Series - Manual (Page 76)

DT4500 Series Down Converters MN/DT4500.IOM
Remote Control Revision 1
58
B.2 P
ROTOCOL
B.2.1 T
RANSMISSION
M
ODE
The transmission mode is half duplex implemented in Command/Response convention.
This method requires the external system monitor and control unit to initiate all
communications by command and all converters to respond with either confirmation or
an error message. The confirmation may contain status information.
B.2.2 B
AUD
R
ATE
The default serial port Baud Rate is 9600. Baud rates of 1200, 2400, 4800, 19200, and
38400 are also supported.
B.2.3 F
ORMAT
The following parameters are the default character format.
1 Start Bit
8 Data Bits
No Parity Bit
1 Stop Bit
B.2.4 C
HARACTER
S
ET
The character set implemented is ASCII.
B.2.5 R
ESPONSE
T
IMEOUT
A minimum of 500 milliseconds should be provided before declaring a ‘no response’
instance, at which time the command should be re-transmitted.
B.2.6 B
US
I
NACTIVITY
R
EQUIREMENT
Comtech EF Data recommends that a minimum of 50 milliseconds bus inactivity be
provided by the user between the receipt of a response from an addressed converter and
issuing the next command on the serial bus.