HN-291D
Serial Commands
These commands affect the serial interface between the modem and the host. The
default settings are 9600 bps and protocol mode 0. Additional serial communications
options, such as parity and data bits, may be selected through the Modbus Adapter
Commands.
Command Description
sd[?|00..FF]
Set Data Rate Divisor
Data Rate Divisor (hex)
1200
bps
=
FF
2400
bps
=
8F
9600
bps
=
23
14400
bps
=
17
19200
bps
=
11
28800
bps
=
B
38400
bps
=
8
57600
bps
=
5
115200
bps
=
2
sp[?|00..14]
Set Protocol Mode
00
= point-to-point transparent mode
01
= basic command and data only
02
= command, data and connection notification
04
–
08
=
reserved for future use
09
= mode
01
during transmit, transparent receive
0A
= mode
02
during transmit, transparent receive
0C
= mode
04
during transmit, transparent receive
0D
–
10
=
reserved for future use
11
= transparent transmit, mode
01
during receive
12
= transparent transmit, mode
02
during receive
Set Data Rate Divisor
Sets the serial bit rate between the modem and the host. This command takes effect
immediately and will require adjusting the host serial rate to agree. Nonstandard rates
may be programmed by entering a data rate divisor computed with the following
formula:
DIVISOR = (345600/RATE)-1
Round all non-integer values down.
Set Protocol Mode
Enables the base station to operate in a multipoint network. Depending on the user
application, more or less acknowledgment may be desired by the application.
Remotes can operate in transparent mode even though the base station is operating in
one of the nontransparent modes. When using a protocol mode, make sure to count in
packet overhead when calculating network performance. Refer to the section on
Protocol Modes for details on each format.
©
2000- 2004 Cirronet
™
Inc
33
M-0910-0002 Rev B
