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RS‐232/485 RF Modem Product Manual – MAN0782‐02
3. RF Operation
WARNING: When operating at 1 Watt power output, observe a minimum separation distance of 2' (0.6 m) between modems.
Transmitting in close proximity of other modems can damage modem front ends.
Serial Communications
RS-232 and RS-485/422 Data Flow
Host and RF Modem I/O Settings
The RS-232/485 RF Modem interfaces to a host device through a standard RS-232 (DB-9)
connector. Devices that have a standard RS-232 serial port can connect directly through the pins
of the RS-232/485 RF Modem as shown in the figure below.
Figure 3.1. System Data Flow in an RS‐232 environment
Serial communications between a host and the RS-232/485 RF Modem are dependent upon
having matching baud rate, parity, stop bit & number of data bits settings. Refer to the table
below to ensure host serial port settings match those of the RS-232/485 RF Modem.
Table 3.1. Parameter values critical to serial communications between the RF Modem and host
Parameter Setting
Baud (Serial Data Rate)
Number of Data Bits
Parity
Number of Stop Bits
Both the RF Modem and host (PC) settings can be viewed and adjusted using Horner's
proprietary RadioSet Software. Use the "Terminal" or "Modem Configuration" tabs to configure
the RF Modem settings. Use the "PC Settings" tab to configure host settings. Refer to the
Advanced Programming and RadioSet Software sections for more information.
RS-232/485 RF Modem Default Parameter Value
9600 bps
(BR parameter = 3)
8
(NB parameter = 0)
None
(NB parameter = 0)
1
(NB parameter = 0)
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