Vaisala WMS302 Guide de l'utilisateur télécharger pdf (Page 217)

Chapter 8 ____________________________________________________________ Technical Data

VAISALA______________________________________________________________________ 215

Channel B can be used either in the RS-485 mode or in the RS-232

mode. In 2-wire RS-485, both transmitted and received data is sent via

this channel. In 4-wire RS-485, this channel can either transmit or

receive depending on the configuration.

Figure 156 on page 214 provides a schematic wiring diagram for the

dual RS-485 connection, the dual 2-wire connection utilizing both

channels. The correct jumper settings for the channel B are listed in

Table 38 on page 215. The jumpers are located on the module as

illustrated in Figure 157 on page 215.

0201-049

Figure 157 DSI486 Default Jumper Locations

Table 38 The Jumper Settings for Channel B in the RS-485

Mode

Jumper Connected

Pins

Function

X3 1-2 Sets the RS-485 mode active for the channel

3-4

X6 1-2

X5 1-2 The line terminating resistor is in use with RS-

485.

1 2 ... 212 213 214 215 216 217 218 219 220 221 222 ... 261 262

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Vaisala WMS302 Guide de l'utilisateur Page 217