6.5 COM Port Settings
When using serial drivers the COM port parameters are defined as “COM1:9600,N,8,1”. In addition, some specific control and debug
parameters can be added for the RTU32M.
The COM port setting strings follow the normal WorkSuite conventions. COMa:b,c,d,e (e.g. COM1:9600,N,8,1).
a) COM port number: 1...3
b) Baud rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
c) Byte size: 7, 8 (bit)
d) Parity N, E, O (none, even, odd)
e) Stop bits 1, 2
A range of additional parameters on the COM port settings are supported to control:
• Setup the COM port for modem dial support – enable the Modem driver.
• Hardware handshake signal on null modem driver.
• Provide communication log in the general RTU32M System Log.
The extensions for these functions and features are:
• When using the modem driver a ‘M’ is added (e.g. MCOM1:9600,N,8,1)
• RTS / CTS hardware handshake control on the null modem serial driver is supported and enabled by the options as follows:
‘RD’ RTS is kept inactive (low) at all time.
‘RE’ RTS is kept active (high) at all time.
‘RT:Leading:Trailing’ RTS is inactive when receiving data, and becomes active when transmitting data. The RTS Leading
setting defines the delay from activating the RTS to when the first character is transmitted. The RTS Trailing setting defines
the delay from when the last character is transmitted to RTS is deactivated.
Leading and trailing time is in units of msec. - e.g. COM1:9600,N,8,1,RT:50:10
‘RC:Leading:Trailing’ RTS is inactive when receiving data, and is activated when the RTU wants to transmit data. After
activating RTS, the RTU will wait for CTS to become active, before start transmitting. The RTS Leading delay is still valid in this
mode, and an adjustable delay from CTS activated to first character is then possible. However, by setting the Leading time to
zero there is no unnecessary delay from CTS to first character (like a normal RTS / CTS function). After activating RTS the RTU
waits up to 10 sec for the CTS signal. If timeout occurs, the transmission is discarded. The RTS Trailing setting defines the
delay from when the last character is transmitted to RTS deactivated.
• Logging of serial data in the System Log.
‘LL’ Log Link data. All bytes transmitted and received on the COM port, are logged in the internal log message
system, and are available using telnet at port 911. This is primarily for debug purpose.
Examples: MCOM3:9600,N,8,1,LL
COM2:57600,E,8,1,RT:30:10,LL
Notes:
If you just connect a serial device, e.g. ModbusRTU communication via a Null Modem cable to the RS232 COM port, it is NOT
required to add any special extensions.
Brodersen WorkSuite has a limitation of max 31 chars in the settings string.
If you enable the SP5 (Secure Protocol for remote communication) on the RTU32 Webpage, you must set the COM
parameters settings for the specific port on the webpage. If the SP5 setting is enabled, the COM settings overrule any later
settings in WorkSuite.
The serial port settings use the same syntax no matter where you configure it.
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