User's Manual
405U Radio Modem Module User Manual
Page 54 © May 2000
1.1.7 Receive Hold-off Time
PARAM = 1 1 0 1 Default = 0 0 0 1 0 1 0 0
A delay time may be configured such that the 405U unit will not transmit a message during
the hold-off time after receiving a message. The maximum hold-off time is 255 msec. The
receive hold-off time value is the 8-bit binary equivalent of the desired time in 1 msec
increments. Hence for a desired hold-off time of 10 msec, a VALUE code of ten (00001010 )
is entered. For the maximum time of 255 msec, a VALUE code of 255 (11111111) is
entered. The default tail time is 20 msec. Appendix B lists the 8-bit patterns for each value
between 0 and 255.
1.1.8 Character Type
PARAM = 1 0 0 1 Default = 0 0 0 0 0 1 0 0
To select or change the data character type, enter the following VALUE code. The
character type should match the type of data handled by the host device connected to that
405U module. The character type is normally the same at each 405U module in the same
system.
The Character Type parameter configures both the character format and the flow control on
the serial port. The character format comprises the number of data bits, start bits, and parity
configuration. The serial port flow control may be configured to enable or disable RTS/CTS
control. In all RS-485 applications and some RS-232 applications, RTS/CTS control must be
disabled.
The default type is 8 data bits, 1 start bit, 1 stop bit, no parity, with disabled RTS/CTS.
NOTE: These values are valid for software Versions 1.11 or later, with configurations
requiring DTR Low Power Mode only. Modules requiring DTR Normal Power Mode
will need to be configured using Register S9 - Character Type.
Data
Bits
Start
Bits
Stop
Bits
Parity CTS/ RTS
control
VALUE
8 1 1 none enabled 0 0 0 0 0 0 0 0
8 1 1 even enabled 0 0 0 0 0 0 0 1
8 1 1 odd enabled 0 0 0 0 0 0 1 0
7 1 2 none enabled 0 0 0 0 0 0 1 1
7 1 1 even enabled 0 0 0 0 1 0 0 0
7 1 1 odd enabled 0 0 0 0 1 0 0 1
8 1 2 none enabled 0 0 0 0 1 0 1 0
7 1 2 even enabled 0 0 0 0 1 0 1 1
7 1 2 odd enabled 0 0 0 1 0 0 0 0
8 1 1 none disabled 0 0 0 0 0 1 0 0
8 1 1 even disabled 0 0 0 0 0 1 0 1
8 1 1 odd disabled 0 0 0 0 0 1 1 0
7 1 2 none disabled 0 0 0 0 0 1 1 1