ABB D674A905U01 Sensor Display Control Unit
ENVIRONMENTAL SPECIFICATIONSThe maximum ambient temperature measured at the hottest point within the Triguard system
shall not be greater than 60 degrees centigrade.
Temperature operating: +5°C to +60°C
Temperature storage: -25°C to +70°C
Humidity 5% to 95% non-condensing at ambient <40°C
EMC/RFI Immunity Tested and certified to IEC 1131-Part 2 1994
Vibration/Shock Tested and certified to IEC 1131-Part 2 1994
Certification:
General Certification: Ref. SC300E Product Guide (ref 008-5209)
TRANSPORT AND HANDLING
The MSR04XI module must be transported and stored in its original packing material which
should be retained for this purpose.
TECHNICAL DESCRIPTION
PHYSICAL
The Serial Communications Module is a 9U high PCB with integral front panel and front and
rear connectors; a plug-in daughter board carries the RS232 interface circuits. Figure 1-1
shows the general layout, location of the connectors and front panel components.
Mechanical coding blocks
All Input/Output modules carry two mechanical coding blocks equipped with pins which mate
with holes in corresponding blocks in the chassis and prevent the module being inserted into
the wrong slot. The pins in the module blocks are factory installed in a pattern determined by
the module and corresponding set screws are removed from the chassis coding blocks to
enable fitting. Unused holes are plugged with set screws. The chassis mechanical coding
block configuration for this module is shown in Figure 2-1 .
Figure 2-1 Chassis mechanical coding block configurations
Links
The PCB has a total of nine links. For the top section of the PCB the links are located and
configured as follows:
Three LK1 links (3-pin) located approximately 80mm down from the top of the module, not user
configurable, link not fitted.
Three LK2 links (8-pin) located approximately 210mm down from the top of the module -
Module ID links which should always be fitted (refer to Figure 1-1).

On the lower section of the PCB are three further links, LK2, LK3 and LK4, located and
configured as follows:
LK2 (2-pin) located approximately 220mm down from the top of the module and 110mm in from
the front face, used in the voltage monitoring circuit, always fitted.
LK3 (3-pin) located beneath the plug in daughterboard. Used for 3-2-1-or 3-2-0 operation,
factory fitted hard wired, all pins linked for 3-2-1 mode.
LK4 (3-pin) located approximately 250mm down from the top of the module and 220mm from
the front face, used for the daughterboard clock speed setting, pins 1 and 2 linked.
Table 2-1. Default link settings
Link Default setting
LK1 (3 off x 3 pin) Links not fitted
LK2 (3 off x 8 pin) Fitted
LK2 (2 pin) Fitted
LK3 (3 pin) Hard wired (all pins linked)
LK4 (3 pin) Fitted (pins 1 & 2 linked)
EXTERNAL CONNECTIONS
Pinouts and signals for front panel connectors J4 to J6 through to J2 backplane are given in
Table 2-2.
Is your interface DTE (data terminal equipment) or DCE (data communications equipment)?:
The point of reference for all signals is the terminal (or PC).
Transmit and receive leads (2 or 3) can be reversed depending on the use of the equipment,
either DTE or DCE.