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Aten IC485AI Руководство пользователя онлайн [12/22] 746972
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1. Multidrop Full Duplex
Multidrop Full Duplex uses reverse four wire cabling, to
link all the connected IC-485AI units:
For all IC-485AI units, set the unit to DCE or DTE
depending on what type of device the IC-485AI will plug
into (if it will plug into a DCE device, configure it for DTE,
and vice versa).
For the Master unit, set SW7 ON; set SW8 ON (RS-422
Master mode).
For all of the Slave units, set SW7 ON; set SW8 OFF (RS-
422 Slave mode).
Note: 1. No more than 31 Slave units can be connected.
2. When any of the Slave units transmits data, none of the
other Slaves may transmit. RTS for all other Slave units
must be pulled low.
Master
T+
T
-
R
-
R+
Slave 1
R+
R -
T -
T+
Slave 2
R+
R -
T -
T+
.
.
.
Slave 31
PC1
COM1/
COM2
PC2
COM1/
COM2
PC3
COM1/
COM2
Содержание
- Fcc information 2
- Sj t 11364 2006 2
- For international online technical support including troubleshooting documentation and software updates http support aten com 3
- For north american technical support 3
- Ic485ai user manual 3
- Online registration 3
- Technical support 3
- Telephone support 3
- Package contents 4
- Features 5
- Overview 5
- Components 6
- Top view 6
- Bottom view 7
- Dip switch configuration 8
- Note 1 the baud rate must be the same for all units on the installation 8
- Note when you change any of the dip switch settings you must reset the device by powering it off then powering it on again 8
- Sw 1 3 baud rate 8
- Sw 4 reserved 8
- The default is 9600 bps 8
- The ic 485ai s settings for baud rate data format and rs 422 rs 485 mode are configured by setting the eight segment dip switch located on its bottom panel 8
- As an rs 422 converter sw8 determines whether the unit is configured for master or slave operation 9
- As an rs 485 converter sw8 determines whether the unit operates in rts control mode or auto send data mode 9
- Note rs 422 is used for 4 wire hookups rs 485 is used for 2 wire hookups 9
- Note the default is 10 bits 1 start 8 data 0 parity 1 stop unless you have a special reason to change this we recommend that you leave it as is if you do change it however all the units on the installation must be changed to match 9
- Operating modes are discussed in detail in the next section and on p 5 9
- Sw 5 6 data format 9
- Sw 7 8 rs 422 rs 485 operating mode 9
- Sw7 determines whether the unit operates as an rs 422 or rs 485 converter 9
- These two switch segments configure the bit settings for start data parity and stop 9
- Operating modes 10
- Point to point 10
- Multidrop 11
- For all ic 485ai units set the unit to dce or dte depending on what type of device the ic 485ai will plug into if it will plug into a dce device configure it for dte and vice versa 13
- For all of the units set sw7 and sw8 according to the table on p to configure each unit s rs 485 operating mode see p 0 for rs 485 operation details 13
- Multidrop half duplex 13
- Multidrop half duplex uses reverse two wire cabling to link all the connected ic 485ai units 13
- Note no more than 31 slave units can be connected 13
- A simplex configuration is one in which more than two devices are linked for communication using several ic 485ai units in a manner similar to multidrop the difference is that in a simplex configuration the master device can only talk and the slave devices can only listen 14
- For all ic 485ai units set the unit to dce or dte depending on what type of device the ic 485ai will plug into if it will plug into a dce device configure it for dte and vice versa 14
- For all of the units master and slave set sw7 on set sw8 on 14
- Note no more than 31 slave units can be connected 14
- Simplex 14
- Simplex uses reverse two wire cabling to link all the connected ic 485ai units as shown in the figure below 14
- A use two or four wire twisted pair cable in a reverse or straight through configuration according to the information provided in the switch configuration and operating modes sections 15
- B see p 7 for the terminal block pin assignments 15
- Installation 15
- Note when the distance between both ends of the installation is large and or the transmitted signals are unstable insert 120 ω terminal resistors between pins 1 and 2 and between pins 3 and 4 on the terminal blocks of the two units at each end of the installation 16
- Note when the distance between both ends of the installation is large and or the transmitted signals aren t stable insert a 120 ω terminal resistor between pins 1 and 2 on the terminal blocks of the two units at each end of the installation 16
- Rs 422 full duplex 16
- Rs 422 rs 485 installation diagrams 16
- Rs 485 half duplex 16
- Appendix 17
- Circuit test 17
- Terminal block pin assignments 17
- In this mode rts is pulled high when the computer makes a request to send data 18
- Rs 485 operation mode flow charts 18
- Rts control mode 18
- The ic 485ai operates in rs 485 rts control mode when both sw7 and sw8 are set to off 18
- Auto send data mode 19
- If the bus line is determined to be idle cts is pulled low and the ic 485ai sends data to the bus line 19
- If the the bus line is busy cts is pulled high and the ic 485ai will not send data to the bus line 19
- In this mode the status of the bus line is auto detected in order to prevent more than one signal on the line 19
- The ic 485ai operaties in rs 485 auto send data mode when sw7 is set to off and sw8 is set to on 19
- Dce dte connection description 20
- Specifications 21
- Limited warranty 22
- Troubleshooting 22
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