Omega A2400 - Manual (Page 35)

Command Set 4-14
The SetUp command requires an argument of eight hexadecimal digits to
describe four bytes of setup information.
Command: $1SU31070007
Response: *
Command: #1SU31070007
Response: *1SU3107000795
Set Time Delay 1 (T1)
T1 is a programmable time delay used to control the RTS output. T1 is used
to guarantee a dead time between the completion of host transmitted data
and the beginning of remote data transmission. The T1 timer is started after
a character has been received by the A2400 on the RS-485 bus. Upon
completion of delay T1, the RS-232 Request to Send (RTS) signal will
become active and delay T2 will begin. T1 delay times are specified in units
of milliseconds with a range of 0 to 2000 ms. The data value must be
formatted as a plus sign, five decimal digits, decimal point, and two more
digits:
Command: $1T1+00100.00 (Set T1 to 100 ms.)
Response: *
Command: #1T1+00100.00 (Set T1 to 100 ms.)
Response: *1T1+00100.008A
Set Time Delay 2 (T2)
The time delay T2 is used as part of the intelligent control of the radio modem
transmitter. After the RTS signal is asserted to turn on the transmitter, T2 is
activated to allow the transmitter time to settle in preparation of the transfer
of data. The minimum time for T2 is usually specified by the radio modem
manufacturer. After the T2 time is complete, the A2400 transfers data stored
in a buffer out the RS-232 Transmit line to the radio modem.
Some radio modems offer a Clear-To-Send signal which can be connected
to the CTS input of the A2400. This is a hardware indicator that the
transmitter is ready and it can substitute for the T2 time.
If CTS input becomes active before T2 expires, delay T2 will be overridden
and the buffered RS-485 data will be transmitted.