Optical Systems Design OSD8327 Series, Operator'S Manual

Page: 13 / 20

OPTICAL SYSTEMS DESIGN
DOC ID: 10116601
OSD8327 OPERATOR MANUAL
PAGE 13
2.3.2
DATA SWITCH SETTINGS
Six (SW1 to SW6) of the 8-way control switches are used for data control. The 8-way switch is located
at the front of OSD8327 modem.
FIGURE 9: DATA MODE SWITCH SETTINGS
TABLE 6: DATA MODE SWITCH SETTINGS
SWITCH STATE FUNCTION
SW1
OFF RS232/RS422
ON 2 WIRE AND 4 WIRE RS485
SW5
OFF NO BIAS RS485
ON BIAS RS485
SW6
OFF RS232/RS422 OR 4 WIRE RS485
ON INVERSE RS232 OR 2WIRE RS485
Switches SW2, SW3 and SW4 are used for setting RS485 turnaround time.
TABLE 7: RS485 TURNAROUND TIME SWITCH SETTINGS
SW2 SW3 SW4 RS485 TURNAROUND TIME
ON ON ON 10us
ON ON OFF 30us
ON OFF ON 100us
ON OFF OFF 300us
OFF ON ON 1ms
OFF ON OFF 3ms
OFF OFF ON 10ms
OFF OFF OFF 30ms
STD 232/485
Bias
Delay
Delay
Delay
RS232/422/485
OFF
ON
1 2 3 4 5 6 7 8