7
4.2. Terminal Description
The supply and external signals must be connected in accordance with the fig. 3.
Individual outlets have been described in the table 1.
Caution:
One must pay a particular attention on the correct connection of external signals
(see table 1)
Fig. 3. Electrical connections of the SMC controller.
The controller has two serial ports, Port 1 and Port 2.
The port 1 is destined for communication with devices of Slave type.
Two RS-485 interface systems are added to the Port 1. The
operation of both systems is identical. Interface systems are electrically connected and galvanically isolated
from the remainder of the system. Interface lines are connected to terminals 1, 2, 3, 4 for the first port, and 5,
6 , 7 , 8 for the second port. The RS-485 bus enables the direct connection to 32 devices with RS-485
interface. The maximal bus length depends on the baud rate and is included in limits from several dozens of
meters for high speeds, up to ca 1.2 km for low speeds.
The port 2 is destined for the controller configuration with the PC computer.
The Port 2 includes RS-485, RS-232 and USB interfaces. The RS-485 interface enables the connection of
the controller to the RS-485 serial bus, its lines has been led out to terminals 14, 15 and 16. RS-232 and
USB interfaces are destined to connect with the Master system.
There are 3 signalling diodes on the frontal plate
D1 Two-colour diodes.
Green colour – continuous lighting – signals a
correct controller work.
Green colour – pulsating – signals the work in the
configuration mode.
Red colour – signals a configuration error.
D2 Green diode
Signals the data transmission from the side of a
slave device type.
D3 Yellow diode
Signals the data transmission from the side of a
master device type.
Table 1. Description of SMC Controller Outlets
Termi-
nal
Terminal description
1
5 V ( for bus bias)
2
Line A of the first RS-485 interface of Port 1
3
Line B of the first RS-485 interface of Port 1
4
Line GND of the RS-485 interface of Port 1
5
Line GND of the RS-485 interface of Port 1
6
Line B of the second RS-485 interface of Port 1
7
Line B of the second RS-485 interface of Port 1
8
5V (for bus bias).
9, 10
Lines of controller supply
11
Not used
12
Output TxD of the RS-232 interface of Port 2
13
Input RxD of the RS-232 interface of Port 2
14
Line GND of the RS-232 and RS-485
interfaces of Port 2
15
Line A of the RS485 interface of Port 2
16
Line B of the RS-485 interface of Port 2
USB
socket
SMC
Содержание SMC series
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