User's Manual

905U-D Radio Modem Module User Manual
Page 52 © May 2000
1.1.1 Operating Mode
PARAM = 0 0 0 0 Default = 0 0 0 0 0 1 0 0
Mode Value Option Connect
Mode
0 0 0 0 0 0 0 0 0 Transparent mode without error-check Host
1 0 0 0 0 0 0 0 1 Transparent mode with error-check Host
2 0 0 0 0 0 0 1 0 Controlled mode without error-check Host
3 0 0 0 0 0 0 1 1 Controlled mode with error-check Host
4 0 0 0 0 0 1 0 0 Transparent mode without error-check Auto
5 0 0 0 0 0 1 0 1 Transparent mode with error-check Auto
6 0 0 0 0 0 1 1 0 Controlled mode without error-check Auto
7 0 0 0 0 0 1 1 1 Controlled mode with error-check Auto
8 0 0 0 0 1 0 0 0 Transparent mode repeater Auto
Host connect modes are suitable for use with host devices that can drive leased-line or dial-
up modems. Units in Host-connect mode power-up in Configuration Mode. They require a
Hayes command to make a connection. eg. ATO for Leased-line or ATDxx - see 4.3 Hayes
Commands.
Autoconnect modes will automatically establish a connection on power-up and automatically
try to re-establish a connection if it is lost.
Note that the programming of a system, unit or destination address using the DIL switches
will cause the unit to default to Mode 4 transparent mode or Mode 7 controlled mode. For this
reason, the Operating Mode parameter must be programmed (if mode 4 or mode 7 are
unsuitable) after entering the address information.
1.1.2 Tail Time
PARAM = 0 0 0 1 Default = 0 0 0 0 0 0 0 0
A tail time may be configured which keeps the radio channel open at the end of each
message. The maximum tail time is 2.55 seconds. The tail time value is the 8-bit binary
equivalent of the desired time in 10 msec increments. Hence for a desired tail time of 100
msec, a VALUE code of ten (00001010 ) is entered. For the maximum time of 2.55 secs, a
VALUE code of 255 (11111111) is entered. The default tail time is zero seconds - that is, no
tail time. Appendix A lists the 8-bit patterns for each value between 0 and 255.
1.1.3 Message Length
PARAM = 0 0 1 1 Default = 1 1 1 1 1 1 1 1
The message length parameter selects the maximum length (in bytes) of the data sent in
each radio message. The length may be selected between 10 bytes and 520 bytes. The
message length is equal to 2x(VALUE)+10, where VALUE is the decimal equivalent of the 8-
bit code entered.