User's Manual

PAC Configuration Manual
Wireless Matrix Corporation #102, 1530 - 27 Avenue NE Page 29 of 62
Document # xxx-xxx-xxx Calgary, AB, Canada T2E 7S6
2002.02.01 Ph. 403.250.3949 Fax 403.250.8163 www.wrx-ca.com
5.1 MODBUS Driver
RTU Driver : Modbus Driver V1.2
KeyCode : MBP
The Modbus protocol driver has the following settings:
RTU
TYpe MBP Set the RTU driver to Modbus.
ASCii <off | on> The default is “off”. Set ASCII “off” for binary (RTU) Modbus.
Set ASCII “on for ASCII Modbus.
DEbug <off | on>
MAXRetries <2> The default is 2.
RXTimeout <2> The default is 2.
BYTEswap <off | on> The default is “off. It should be enabled for devices that
provide Intel byte order.
COMM
POrt <COM1 | COM2 | COM4> The RTU driver must use COM2
(RS232) or COM4 (RS485). COM1 is the network port for the TPAC.
BAud <1200 | 2400 | 4800 | 9600 | 14400 | 19200 | 28800 | 38400>
DAtabits <7 | 8>
PArity <None | Even | Odd>
STopbits <1 | 2>
The Modbus driver is the default driver on a new TPAC. The Modbus driver in the TPAC
supports ASCII and RTU (binary) modes. This driver will be explained in more detail then
other drivers because it is the most common end device protocol. The following figure
shows the Modbus (MBP) driver being set.
Figure 17: Select the Modbus driver
After a new driver is specified, the TPAC reboots and the defaults for the new protocol are
loaded. Modify the default parameters to match the protocol of the end-device. The next