RS232 LOW COST RF MODEM
FM-232C-433
HOST COMMUNICATION SPEED (J2, J3)
The data link between the Modem and the host computer may be set using the appropriate jumper links on the
Modem circuit board. It is set according to the following table.
J3
Open
J2
Open
Baud Rate
1,200
Open
Connected
Connected
Connected
Open
Connected
2,400
4,800
9,600
note: The host communication link is ONLY the speed of communications between Modem and the host PC,
The radio communications speed is controlled by the two Modems which are communicating which is
dependant on many other factors.
MASTER / SLAVE SELECTION (J13)
J13
Open
Connected
Option
Slave Mode
Master Mode
MASTER / SLAVE ADDRESS SELECTION (J6-12)
Used to set the modem’s address when in master or slave operation
Link no
Address bit
J12
6
J11
5
J10
4
J9
3
J8
2
J7
1
J6
0
(MSB)
(LSB)
Note: if the address links are set to zero (all address jumper links open) then the modem will be in Broadcast
mode (see below for full description)
DATA FLOW CONTROL (J4, J5)
J4
Connected
Open
J5
Open
Connected
Open
Option
Hardware Flow Control (RTS/CTS)
XON/XOFF Flow Control
No Flow Control
Open
J18 - J21 RS232/5V data Input, these jumpers are used to set the data into the modem, either as RS232 data
or 5V inverted data. Usually set between pins one and two in all cases to select RS232 data in.
DS232_2
June 00
©2000 Reg. No. 227 4001, ENGLAND
Page 3
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