ProSoft Technology 5202-DFNT-MCM4 - Manual (Page 49)

Modbus Port Expander (4102/5102-MBS3-MBM) MCM ♦ ProLinx Gateway
Driver Manual Modbus Master/Slave
ProSoft Technology, Inc.
Page 49 of 80
October 16, 2009
Note: On all ProLinx gateways, data from the application port on the main board, serial Port 0, is
not buffered. Packets go directly to and from the serial chipset to the processor. This has the
potential to cause the serial communications to become erratic at baud rates above 38,400 baud.
ProLinx gateways with 4 serial ports have a separate serial interface board for serial Ports 1, 2,
and 3. These serial ports are buffered, and can handle communications up to 115,200 baud.
7.1.4 Parity
N ONE , O DD , E VEN
Parity is a simple error checking algorithm used in serial communication. This
parameter specifies the type of parity checking to use.
All devices communicating through this port must use the same parity setting.
7.1.5 Data Bits
7 or 8
This parameter sets the number of data bits for each word used by the protocol.
All devices communicating through this port must use the same number of data
bits.
7.1.6 Stop Bits
1 or 2
Stop bits signal the end of a character in the data stream. For most applications,
use one stop bit. For slower devices that require more time to re-synchronize,
use two stop bits.
All devices communicating through this port must use the same number of stop
bits.
7.1.7 RTS On
0 to 65535 milliseconds
This parameter sets the number of milliseconds to delay after Ready To Send
(RTS) is asserted before data will be transmitted.
7.1.8 RTS Off
0 to 65535 milliseconds
This parameter sets the number of milliseconds to delay after the last byte of
data is sent before the RTS modem signal will be set low.