2.5.2 Serial Standard Conversion
Figure 2.5.3 In serial conversion mode, one can convert from RS232 to RS485 / RS422
Figure 2.5.3 illustrates the connections for conversion between RS232 and RS485 / 422 devices.
In this mode of operation, RS232 voltage levels are converted to the appropriate RS485 or RS422
signaling levels depending on the DIP switch configuration. In this mode of operation position 2 of
the DIPswitches must be in the ON position. Figure 2.5.3 illustrates a RS232 device, connected to
an RS485 device or network. Since RS485 requires automatic turn-around, position 3 must be set
to the OFF state, and position 6 – 8 of the DIP switches must reflect the proper operating baud
rate.
Note: In this mode of operation, no isolation is provided between RS232 device and the
RS485/422 network – both devices share the same common terminal. It should be noted
that the common terminal on RS232 devices are connected to ground. In some instances
(ie when connecting to large RS485 networks), it may be preferential for the user to leave
the RS485/RS422 shield terminal unconnected to the RMC20 in this mode.
15
©
2006 RuggedCom Inc. All rights reserved
Rev100
