Omega A2400 manual

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.