Bronkhorst Modbus slave interface - Manual (Page 14)

BRONKHORST ®
3.3 Via RS232: other programs
It is also possible to read and or change the slave address or baud rate by means of any program via RS232 using the
COM-port of your PC on 38400 baud.
More information about the RS232 protocol can be found in document 917027 Manual RS232 interface
This document can be found at:
http://www.bronkhorst.com/en/downloads/instruction_manuals/
3.4 Via micro-switch and LED’s on the instrument (if present)
With the micro-switch on the instrument it is possible to change and readout the settings for slave address and baud
rate. The LED’s will indicate the tens of the address with green flashes and the units with red flashes. For baud rate-
indication both LED’s will flash.
3.4.1 Readout bus-address/MAC-ID and baud rate:
Pressing the switch 3x briefly with intervals of max. 1 second in normal running / operation mode will trigger the
instrument to “show” its bus-address/MAC-ID and baud rate.
For indication the bus-address/MAC-ID the green LED will flash the amount of tens and the red LED the amount of
units in the number. For indication of baud rate setting, both LED’s will flash.
The flashes are called “count-flashes” and have a pattern of 0.5 sec. on, 0.5 sec. off.
LED indications for bus-address and baud rate
Green LED Red LED Time Indication
   Green    Red
amount of count flashes
(0...12)
Off
0 ... 12 sec.
Maximum
tens in bus-address for instrument
Off
Amount of count flashes
(0...9)
0 ... 9 sec.
Maximum
units in bus-address for instrument
amount of count flashes
(1...5)
amount of count flashes
(1...5)
1 ... 5 sec.
Maximum
baudrate setting for instrument
1 = 9600 Baud
2 = 19200 Baud
3 = 38400 Baud
4 = 57600 Baud (MBC3 type only)
5 = 115200 Baud (MBC3 type only)
Note: Value zero will be indicated by a period of 1 sec. off (0.5 sec. off + 0.5 sec. off).
Examples:
• For bus-address 35 and 9600 baud the green LED will flash 3 times, the red LED will flash 5 times and both
LED’s will flash 1 time.
• For bus-address 20 and 19200 baud the green LED will flash 2 times, the red LED will flash 0 times and both
LED’s will flash 2 times.
• For bus-address 3 and 38400 baud the green LED will flash 0 times, the red LED will flash 3 times and both
LED’s will flash 3 times.
Page 14 Modbus interface 9.17.035