RS232 RADIO MODEM
232C-868FR1
R/W
S212
Parity
Indicates the parity on the serial link:
'1' -> No parity (default value)
'2' -> Even Parity
'3' -> Odd Parity
R/W
R/W
R/W
R/W
S213
S214
S216
S218
Number of
Stop Bits
Number of Stop bits on the serial link:
'1' -> 1 Stop bit (default value)
'2' -> 2 Stop bits
Time-out
Time-out in milliseconds on the serial link. Valid between 2 and 100
milliseconds.
Default value: 5 ms
Flow Control Indicates the flow control mode:
‘0’ -> RTS/CTS
‘2’ -> None (Default value)
Buffer size
Indicates the maximum size of frames. When this maximum size is
reached, the modem switches the CTS signal.
Valid between 30 and 245 bytes.
Default value: 245 bytes
Operation
Access
Register
Name
Description
R/W
S220
Operating
Mode
Indicates the operation mode of the modem.
'1'
'3'
->
->
->
->
->
->
->
Transparent (Default value)
Transparent Secured
Master I/O
'6'
'7'
Slave I/O
'9'
‘10’
‘11’
Addressed Secured
Demo mode – master
Demo mode – slave
R/W
R/W
S221
S223
Autorepeat
Indicates auto-repeat status in transparent mode (i.e. whether the
modem automatically replies a data frame)
’0’ -> Autorepeat off (Default value)
‘1’ -> Autorepeat on
Number of
Retries
Indicates the maximum number of retries when a message contains
errors in secured mode. Valid between 0 and 255 (modulo 256). If the
value is ‘0’, frames are not checked and considered as good (used for
tests).
Default value: 2
Addressed Management
Access
R/W
Register
S250
Name
Network
Number
Description
Indicates the network number using 2 bytes. Only
members of the same network can communicate
together. Valid between 0 and 65535 (modulo 65536), it is set to ‘0’
when the modem is not initialised.
NB: Setting S250 to ‘0’ also sets S252 to ‘0’.
Default value: 0
DS232-4 June ’04
©2004 Reg. No. 227 4001, ENGLAND
Page 11
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