CM312 Datasheet, PDF (30/56 Pages) List of Unclassifed Manufacturers – Communications utilityModule

BA + 5-- RS-422 TxD operation (W)
7
6
5
4
3
2
1
0
TxD+/-CN6 TxD+/-CN5 TxD+/-CN4 TxD+/-CN3
CN6
CN5
CN4
CN3
For each CNx bit:
0 = use RTS to enable transmitter or transmitter always on as defined by BA + 4 register CNx bit
1 = Use TxD to enable transmitter, transmitter data is tied low
For each Txd+/-CNx bit if corresponding CNx bit is 1:
0 = Use TxD to enable transmitter
1 = Use inverted TxD to enable transmitter
RTS
TxD
+5V
0
1
0
0
1
1
REG5[7:4]
REG5[3:0]
BIT PER
BIT PER
CHANNEL
CHANNEL
1
REG4[3:0]
BIT PER
CHANNEL
0
1
0 _REG4[5]
ALL
CHANNELS
Enable
TxD+
TxD-
RS-422/485 Driver
RS-422/485 mode configuration. All switches are shown in power on default conditions.
Figure 3 RS-422/485 Mode Configuration
CM312 Quad Serial utilityModule
20
RTD Embedded Technologies, Inc.