User Manual

MDS 05-4670A01, Rev. E SD Series Reference Manual (x710 Mode) 15
4.7 COM2 (Data) Connections
The COM2 port (Figure 14) is used to connect the radio to an external
DTE telemetry device supporting the EIA/RS-232 or EIA/RS-485 (bal-
anced) format, depending on how the radio is configured. Typically, a
straight-through DB-9 cable is used to connect to COM2 . The radio sup-
ports data rates of 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600,
and 115200 bps (asynchronous data only). The following data formats
are supported:
Table 7 and Table 8 provide detailed pin descriptions for the COM2 data
port in RS/EIA-232 mode and RS/EIA-485 mode, respectively.
NOTE: Make sure the PORT setting from the PORT command matches the
type of interface you are using (RS-232 or RS-485). The default is
RS-232.
NOTE: To prevent unintended keying of the transmitter on RTS, set
RTSKEY to OFF , or do not connect to Pin 7 (RTS) of the COM2 port.
Pin Descriptions—
RS/EIA-232 Mode
Table 7 lists the COM2 port pin functions when configured to operate in
RS/EIA-232 mode.
NOTE: The radio is hard-wired as a DCE device.
Table 6. Data Formats
Character Bits Parity Stop Bits
8 No 1
8 No 2
8 Odd 1
8 Odd 2
8 Even 1
8 Even 2
7 No 1
7 No 2
7 Odd 1
7 Odd 2
7 Even 1
7 Even 2
Figure 14. COM2 Connector (DB-9F)
As viewed from outside the radio
5
9 6
1