Fieldbus Appendix - ANYBUS®-S Modbus RTU DOC. ABS-APPENDIX-RTU Rev 1.00 2003-04-28
3.1.3 2 mm connector
Pin |
Name |
Functiion |
|
|
|
1 |
PE |
Protective Earth |
|
|
|
2 |
GND (GALV) |
Ground |
|
|
|
3 |
NC |
Not connected |
|
|
|
4 |
NC |
Not connected |
|
|
|
5 |
RS485 A - LINE |
|
|
|
|
6 |
RS232 - RX |
Receive signal |
|
|
|
7 |
RS485 B - LINE |
|
|
|
|
8 |
+5 V (GALV) |
Power supply |
|
|
|
9 |
RS232 - TX |
Transmit signal |
|
|
|
10 |
NC |
Not connected |
|
|
|
Table 3: 2 mm connector
3.2 Baudrate
The baudrate on a Modbus RTU network is set during configuration of the master. Only one baudrate is possible in a Modbus RTU installation. The AnyBus-S Modbus RTU module has a switch which is used to configure the baudrate. Baudrates supported by the AnyBus-S Modbus RTU module are:
Baudrates supported by AnyBus-S Modbus RTU
1200 kbit/s
2400 kbit/s
4800 kbit/s
9600 kbit/s
19200 kbit/s (standard on RTU)
38400 kbit/s
57600 kbit/s
Table 4: Supported baudrates by Modbus RTU
These baudrates are in the error-margin 0.16% to 1.76%.
Note: The baud rate cannot be changed during operation.
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HMS INDUSTRIAL NETWORKS AB |