Optelecom 9522A Installation And Operation Manual page 28

 Set the Data Tagging for the Primary Data Port with switch S1-10. If the Data Tagging Feature is
enabled, ALL modems in the network must have this feature enabled. If there are modems in the network
that do not support this feature, it MUST be disabled. Refer to Table 2 and the System Architecture section
for details on this function.
Table 2 — Switch 1 and Switch 6, Primary Port Data Settings, Master Echo, Data Tagging
1 2 3
Up
Up
Up
Down
* T = Termination, normally on for RS422, optional on RS485; Down = Termination ON; Up = Termination OFF
 If required, set the data type for the Secondary Data Port. This is done on S1-8 and 9 and S6-1 thru 4.
Insure that you have set the RS485 and RS422 termination switches (S4-3 and S4-4) correctly. In general,
the last unit on an RS485 and RS422 bus should have the terminators enabled by setting the switches
down. Insure that you have set the RS485 and RS422 termination switches (S6-3 and S6-4) correctly. In
general, the last unit on an RS485 and RS422 bus should have the terminators enabled by setting the
switches down. Refer to Table 3 for details on this function.
Table 3 — Switch 1 and Switch 4, Secondary Port Data Settings
1 2 3
4 5 6
Up Up
Down Up
Down Down
Down Down
4 5 6
Up
Up
Up
Down
7 8 9
Down
Up
7 8 9
Up Up
Down Up
Down Down
Down Down
28
Switch 1 - Primary Data Port
10
Settings
Switch 6 - Primary Data Port
Settings
1 2 3
U U N/A
U U D
U U T*
D D T*
Primary Port Master Echo Cancel
Settings
Echo Cancelled (MFT mode only)
Echo Enabled (MFT mode only)
Data Tagging Settings
Down Data Tagging Enabled
Up Data Tagging Disabled
Switch 1 - Secondary Data Port
10
Settings
Switch 4 - Secondary Data Port
Settings
1 2 3
U U N/A
U U D
U U T*
D D T*
4
N/A RS232
D RS422
T* RS485 4-wire
T* RS485 2-wire
4
N/A RS232
D RS422
T* RS485 4-wire
T* RS485 2-wire