Optical Systems Design OSD730, Руководство оператора

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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