Connect Tech Xtreme 104 Opto, User Manual

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22 RS-232/RS-485/422 Option
Xtreme/104 Opto User's Manual, ver. 0.00
Multi-drop Slave Mode
By jumpering positions A and C of jumper blocks JB4, JB5, JB6,
JB7 and by jumpering J1(ports 1 & 2) or J2(ports3 & 4) you can
run the individual RS-485/422 ports in multi-drop slave mode.In
this mode the TxD line driver is enabled only when data is
transmitted and RxD is enabled all the time. This mode is
typically used in multi-drop "4 wire" connections.
Figure 1 shows the locations of jumper block JB4, JB5, JB6, JB7
and J1, J2.
Example
The example below shows the settings on JB4, JB5, JB6, and
J1, J2 where RS-485 ports 1, 2 are set for multi-drop slave
mode. Ports 3, 4 are RS-232 and therefore should not be set
for multi-drop slave mode
JB4
A
JB5
B
C
D
E
F
G
A
B
C
D
E
F
G
JB6
A
B
C
D
E
F
G
JB7
A
B
C
D
E
F
G
J1
Jumper is
on J1
J2
Jumper is
off J2
Technical Note:
J1 controls ports 1 and 2 and J2 controls ports 3 and 4. If both
ports 1 and 2 are set for full duplex then J1 should not be
jumpered. If both ports 3 and 4 are set for full duplex then J2
should not be jumpered.