Download KITZ204 User Manual GB

R8563G
User Manual
Page 14/107
4.1.3.2
KITZ 204
Port 2 RS485 Recommended cable
The RS485 specification does not define connector type or pinout, so a cable suitable
for connection between the KITZ204 connector, which is specified in Section 4.1.3.3
below, and that provided by the RS485 master will be needed.
4.1.3.3
Port 2 RS485 Termination
The pinout of the rear port 9-way female ‘D’ connector is as shown in Table 3:
Pin number Function
Direction
SHELL
Protective ground
–
1
Signal ground GND
–
4
Data signal TXRXA
In/Out
5
Data signal TXRXB
In/Out
TABLE 3 - CONNECTION FOR THE REAR RS485 SERIAL CONNECTOR
The screen of the RS485 cable should be earthed at one point of the cable only.
When earthing at the KITZ204, the screen should be connected to the ‘D’ connector
shell which forms the protective ground and is connected to 0V via the case.
The data signal lines, TXRXA and TXRXB should be terminated at both extreme ends
of the cable with resistors. The value of each resistor must be close to the
characteristic impedance of the cable, which is typically 100 – 120.
The signal ground of RS485 connection is not connected to the 0V of the unit. This
ensures that no earth loop currents can flow between the KITZ204 and other
connected equipment.
4.1.3.4
Port 2 RS485 Cable length
The maximum cable length according to the RS485 specification is 1000m.
4.1.4
Port 1 optical fibre (VDEW/IEC60870-5-103) connection
4.1.4.1
Port 1 optical fibre Connection method
The rear optical fibre port is suitable for direct point to point connection between the
unit and a remote optical transmitter and receiver. The port consists of one Transmit
fibre connection and one Receive fibre connection.
4.1.4.2
Port 1 optical fibre Recommended fibre
The optical fibre used should be 850nm multimode glass fibre (50/125μm and
62.5/125μm are suitable).
4.1.4.3
Port 1 optical fibre Termination
The BFOC/2.5 (ST) connector type
VDEW/IEC60870-5-103 specifications.
4.1.4.4
is
used,
in
accordance
with
the
Port 1 optical fibre length
The transmitter and receiver capabilities allow a distance of 1 km of fibre between the
KITZ204 and the master connection.