TW-100D, TW-100DB, TW-100Dm, TW-100DBm, TW-115B
- Technical Documentation
25.9.2007 © E.L.B. Ex-Geräte Bachmann GmbH Page 3
General
Information
1 Functional
Description
The interface series TW-100D... and TW-115B isolates a PC in the safe area
electrically from a keyboard, a mouse or other PS/2 or RS232/RS485-devices
in the Ex area. This separation concerns the signal lines as well as the power
lines. Therefore these devices do not need to be connected to ground. TW-
100D or TW-100DB and TW-115B are mounted in the safe area, while TW-
100D
m
or TW-100DB
m
may be mounted inside of the Ex area as well.
The connected devices inside of the Ex area have to be approved for intrinsic
safety and match the data for intrinsically safe circuits in chapter 5. There are
two versions concerning this electrical data (type name with or without "B"),
see table below.
RS232 data can be translated and sent to the safe area as RS485 data to the
safe area in order to increase transfer range. This is not possible for the
opposite direction. The transfer range is significantly depending on the cable
type, the baud rate and the electrical distortions.
TW-100D... and TW-115B have a built-in keyboard wedge with one keyboard
and one mouse socket, which makes communication with the PC possible
even from the safe area. Chapter 10 shows sensible connection examples.
TW-1... and the connected PS/2 devices are supplied by the PC. In case of
RS232 or RS485 transmission exclusively the interface can by supplied with
an external plug-in supply, for details see chapter 10.
Safe Area
Ex Area
0,7 W / 135 mA / 1,6 mH TW-100D TW-100Dm
1,2 W / 250 mA / 0,27 mH
TW-100DB
TW-115B
TW-100DBm
TW-100D is the standard version.
TW-115B is TW-100DB for group I (mining), see also chapter 5.
2 Delivery
Components
Delivery includes:
-
TW-100D or TW-100DB respectively, TW-100Dm, TW-100DBm, TW-
115B, configuration according to order no. or your special order
-
Operating
manual
-
5V wall plug-in power supply if necessary (for exclusive RS232 or RS-485
transmission)