GE Mark VIeS System Manual page 298

9.3.6.3 RS-422
• There is the need to provide a termination resistor at either end of a transmission line.
• SSCA provides selectable termination resistors for each pair of signal lines.
• Jumpers JP#A and JP#B apply or remove the termination resistors between signals A-B and C-D.
• Above Point 3 function is repeated for each serial communication channel. The default jumper position is to disconnect
the termination resistor.
• The SSCA is clearly marked to display the relationship of the termination jumpers and the serial communication channel
signals.
The configuration at SSCA jumper (JP#A, JP#B set to IN) must match the ToolboxST configuration as displayed in the
following diagram. The 120 Ω resistance selection is used as an example.
Channel SCOM
Channel 1 26
Channel 2 25
Channel 3 13
Channel 4 14
Channel 5 02
Channel 6 01
Protocol A
RS-422 TX+
RS-485 TX/RX+
RS-232C DTR/RTS
298 GEH-6855_Vol_II
Terminal Board Screw Connections
A B
28 30
27 29
15 17
16 18
04 06
03 05
B C
TX- RX+
TX/RX- Jumper from A
TX CTS
GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
C
32
31
19
20
08
07
D Cable Length
RX- Up to 305 m (1000 ft)
Jumper from B Up to 305 m (1000 ft)
RX Up to 15 m (50 ft) or 2500 pF
Public Information
D RET
34 36
33 35
21 23
22 24
10 12
09 11