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ICEPIC-PSU-INTL 参数 Datasheet PDF下载

ICEPIC-PSU-INTL图片预览
型号: ICEPIC-PSU-INTL
PDF下载: 下载PDF文件 查看货源
内容描述: RS232低成本RF调制解调器 [RS232 LOW COST RF MODEM]
分类和应用: 调制解调器
文件页数/大小: 6 页 / 75 K
品牌: RFSOLUTIONS [ RFSOLUTIONS.LTD ]
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RS232 LOW COST RF MODEM  
FM-232C-433  
MASTER SLAVE COMMUNCATION  
When the modems are configured in a master / slave arrangement only the master can initiate  
communications. If a number of slaves are used within a network (all with different addresses) then the  
master will need to initiate communications with each slave modem in turn. This can be achieved by changing  
the address of the master modem from the host controller (see below).  
Note: If two modems are both set to master with the same address then either modem can initiate  
communications.  
TRANSMIT ADDRESS SELECTION  
There are two methods of selecting the transmit address;  
1. Jumper Link Header (JL) - Through the address jumper links.  
2. Host Selected (HS) - By host controller to which the Modem is connected. (See below)  
SENDING A NEW TRANSMIT ADDRESS FROM THE HOST CONTROLLER  
The host generated address is communicated to the Modem via the standard RS232 data link. In order for the  
RF Modem to determine that the data being received from the host controller is a new transmit address (and  
not actual data to be transmitted), a specific command must be sent as below;  
ZCZCnnnNNNN  
where ZCZC is the transmit new address start identifier  
and nnn is the new 3 digit address.  
and NNNN is the transmit new address end identifier  
The address is stored in volatile memory and will be lost on power down. If the modem is set to either master  
or slave then it will read its own address jumper links as a default on power up. This enables point to point  
communication between two master modems if they both have the same addresses on power up.  
CLEARING THE CD  
When using the modems in a master slave situation it might be necessary to clear down the CD between the  
two modems. This will enable the master to talk to another slave immediately and not have to wait for the 60  
seconds until the CD automatically clears down. This is achieved by sending the following string of characters  
from the master modem via the standard RS232 data link;  
ZCZCCCCCNNNN  
BROADCAST MODE  
Broadcast mode can be used to send data from the master modem to all of the slave modems within range.  
When the master modem’s address is set to zero it is then in broadcast mode. Broadcast mode is one way  
communication only and because of this if any of the data is lost in the transmission the slaves will not be able  
to request the data to be sent again by the master.  
Note: The CD will only be active for 5 seconds in Broadcast mode  
DS232_2  
June 00  
©2000 Reg. No. 227 4001, ENGLAND  
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