Ssca Configuration; Rs-232C (Point-To-Point) - GE Mark VIeS System Manual

9.3.6 SSCA Configuration

For the six serial communication channels:
• Jumpers JP1A through JP6A apply or remove termination resistors between signal lines A and B
• Jumpers JP1B through JP6B apply or remove termination resistors between signal lines C and D
• Jumpers JP1R through JP6R select whether the return has a resistive or capacitive connection to SCOM.
All other configuration is performed from the ToolboxST application. Electronic selection of the serial communications
method, either RS-232C, RS-422, or RS-485, is internal to the I/O pack.

9.3.6.1 RS-232C (Point-to-point)

• It is often not desirable to have a hard ground of the Ret signal path on both ends of a cable. SSCA includes jumper
selectable grounding options for each of the six Ret lines.
• The line may be grounded through a 100 Ω resistor or, through a 0.01 uF capacitor / 1 M Ω resistor parallel combination.
• If the device attached to SSCA features a hard ground of the Ret line then the capacitive ground should be selected on
SSCA. If there is not a hard ground on the connected equipment then the resistive ground (default position) should be
selected on SSCA.
• Ret ground jumpers are identified on SSCA as JP1R through JP6R. Positions are displayed as RES and CAP for resistive
and capacitive return connection. The jumpers are clearly labeled on the SSCA.
In general, if the information on third-party side hardware configuration (hard ground or not) is available during pre-FAT,
keep Ret with resistance ground. The JP#R stays connected to RES (Default), and configuration must match the ToolboxST
application configuration, as displayed in the following diagram.
Note If a computer is connected as a test simulation device (with MODSIM running), the wire from Pin-5 of D-Type
connector must be connected to SCOM1.
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
296 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