OPTICAL SYSTEMS DESIGN
DOC ID: 10102908
OSD730 OPERATOR MANUAL
Page 14
2.3.2
CONTROLS
The OSD730 has one set of controls at the front between the optical connectors. This DIP switch package has 4
switches. Switch 1 selects between RS422 and RS485 mode for data channel 1, Switches 2,3,4 select the time
delay between transmit enable and receive enable when in RS485 mode.
In Table 7 below, switches are labelled as on the front of the OSD730, “0” represents the switch in the DOWN
position, “1” represents it in the UP position.
TABLE 7: RS485 DELAY TIME CHART
T1
T2
T3
Delay Time
0
0
0
43us
1
0
0
85us
0
1
0
341us
1
1
0
1.36ms
0
0
1
5.46ms
1
0
1
10.9ms
0
1
1
43.7ms
1
1
1
87ms
Note: RS-485 mode is only available when channel one is configured for RS422 operation. 2-wire RS485 is
available on pins 2 and 17. Refer to Table 3 for polarity and connections.
FIGURE 7: OSD730 SWITCH SETTINGS
1 2 3 4
RS485/ T1 T2 T3
RS422
