ABB 500 Series Builder's Manual page 83


Configuring the 56/64 kbit data
communication modules
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A Designations of terminals according to ITU (CCITT), EIA etc.
B Designations of terminals according to ITU (CCITT), EIA etc.
DCE Data communication equipment (= multiplexer, etc.)
DTE Data terminal equipment (= protection)
DTE READY Data terminal ready (follows auxiliary voltage)
GND Earth (reference for signals)
RCLK Receiver signal timing
REQ SEND Request to send (follows auxiliary voltage)
RXD Received data
SCREEN Connection of cable screen
TCLK DCE Transmitter signal timing from DCE
TCLK DTE Transmitter signal timing from DTE
TXD Transmitter data
For the co-directional operation the transmission rate of the transmitted signal must be
set.This setting, 56 or 64 kbit/s, is done on the HMI under:
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For X.21 and contra-directional operation no settings are available.
For the signals used by the protection, the communication module for V.36 also fulfils
the older recommendation for V.35.
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No setting is available for the G.703 modem on the HMI. There are however some set-
tings that can be made on a DIP-switch located behind the cover around the line con-
nector at the back of the terminal according to
disconnected, if attached, the cover plate can be removed just by pulling at the middle
of the cover plate. No settings are located on the circuit board.
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figure 39. After the connector has been
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