RS232 R
ADIO
M
ODEM
•
232C-868FR1
You can add one frame ending character: Carriage Return<CR>, after each received frame.
This in order to distinguish each frame.
Example: "002=1458<CR> 003=4587<CR>" indicates data frame "1458" comes from Client No.2, and
data frame "4587" comes from Client No.3.
•
No server, each client can communicate with each other.
•
Maximum of clients per network = 255, maximum of networks = 65535.
•
The data frame format can be configured (client ID at beginning, CR at end, Adcon modems
frame format compatibility) via register S255.
2.1.5
Basic illustration of transparent modes
Transparent mode
Serial Link No.1:
Serial Link No.1:
<ABCD> -> <ABCD>
<FGHI> <- <FGHI>
: Serial Link No. 2
: Serial Link No. 2
Transparent secured mode
Serial Link No.1:
<ABCD> -> <ABCD>
ACK <- ACK
Serial Link No.1:
<RSTU> -> <RDTU>
NACK <- NACK
<RSTU> -> <RSTU>
ACK <- ACK
Serial Link No.1:
<FGHI> <- <FGHI>
ACK -> ACK
Transparent addressed secured mode
Serial Link No.1:
2=<ABCD> -> 1=<ABCD>
ACK <- ACK
Serial Link No.1:
2=<RSTU> -> 1=<RDTU>
NACK <- NACK
2=<RSTU> -> 1=<RSTU>
ACK <- ACK
Serial Link No.1:
2=<FGHI> <- 1=<FGHI>
ACK -> ACK
: Serial Link No. 2
: Serial Link No. 2
: Serial Link No. 2
: Serial Link No. 2
: Serial Link No. 2
: Serial Link No. 2
: Serial Link No. 2
: Serial Link No. 2
2.1.6
I/O Copy mode
In I/O Copy mode the I/O lines of a RF modem are copied to the other RF Modem. The following
registers have to be programmed:
•
Master: S220=6 and S260 for the I/O configuration.
•
Slave: S220=7 and S260 for the I/O configuration (‘complementary’ configuration according to
master)
Once configured as above, both modems start I/O copy as soon as they get out of Hayes mode (ATO
command).
•
This mode works as follows:
•
The master sends its input values to the slave.
•
The slave sends an Ack to the master when the ‘input’ data arrived.
•
The slave copies the master’s input on its output.
•
After a 1 second time-out, the slave sends its inputs to the master.
•
The master returns an ‘Ack’ when the input data is arrived.
•
The master copies the slave’s inputs to its outputs.
•
After a 1 second time-out, the master sends its inputs to the slave.
•
And so on…
DS232-4 June ’04
©2004 Reg. No. 227 4001, ENGLAND
Page 7
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