RTcom Radio Modems Manual de usuario descargar pdf (Pagina 16)

Test modes :

Test modes are provided to assist installation. Whenever test mode is selected the modem will produce a

test transmission to aid both antenna alignment and propagation tests.

Mode

SW1, 7

Mode

SW1, 8

RTcom

Universal

RTcom Global RTcom Global

1200 (special)

OFF OFF No test mode No test mode No test mode

OFF ON TESTMODE 1 TESTMODE 1 TESTMODE 1

ON OFF TESTMODE 2 TEST MODE 3 TEST MODE 2

ON ON TEST MODE 1 TEST MODE 1 TEST MODE 1

Tab. 9 : Test modes (Universal & Global)

TESTMODE 1 : This enables the RF transmitter and transmits a tone at the selected baud rate

(mark : space ratio = 1:1)

TESTMODE 2 : This enables the RF transmitter and transmits a tone at the selected baud rate

(mark : space ratio = 2:1)

TESTMODE 3 : This transmits a fixed 24 character string every 0.5 seconds.

String : RTcom GLOBAL Tx No * where * increments from 0 to 9 repeatedly. The

receiver modem will detect this string and pass it onto its host. However it will also count

the number of characters in the packet (24) and light the ‘Red’ LED to indicate valid

packet. This LED will extinguish within 1 second unless another test packet is detected.

Therefore, during a site survey, if the ‘red’ LED stays lit while the transmitter transmits the

test packet, the link is reliable. Adding signal attenuators in the coaxial cable will reduce

the signal strength and the margin can be measured at the point the LED starts flashing or

extinguishes.

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RTcom Radio Modems Manual de usuario Pagina 16