24
SD Series Technical Manual
MDS 05-4846A01, Rev. H
4.7 Serial Data Interfaces
COM1
and
COM2
on the front panel serve as the serial interface ports for
radio management and payload data, respectively. The following sec-
tions identify the pin functions used on each interface. These ports are
user-configurable for specific applications. The procedures for changing
their default operation are provided later in this guide.
NOTE:
Not all PCs have a serial port. If one is not available, a
USB-to-Serial adapter and appropriate driver software may be
used to provide serial connectivity. These adapters are avail-
able from several manufacturers, including GE MDS.
COM1 (Serial) Connection
The default factory settings for the radio’s
COM1
port (Figure 18)
assigns it for management or diagnostics of the radio via a serial connec-
tion to a PC.
COM1
may be used to set basic parameters such as output
power, modem type and operating frequency of the radio, using text
commands.
COM1 management provides an alternative to the web-based SD
Device
Manager
, accessible via the Ethernet RJ-45 port (see Page 23) when
Ethernet connectivity is not available. If you wish to use serial or Telnet
control, refer to the
SD Serial/Telnet Management Supplement
, Part No.
05-6193A01.
For typical applications, a straight-through DB-9 cable may be used for
PC management on
COM1
. If desired, a cable may be constructed as
shown in Figure 19, using Pins 2 (RXD), 3 (TXD), and 5 (Ground).
Table 7 lists all
COM1
pins.
5
Unused
6
Receive Data (RX)
Low
7
Unused
8
Unused
Figure 18. COM1 Connector (DB-9F)
As viewed from outside the unit
Table 6. Ethernet Port (IP/Ethernet) Pinouts (Continued)
Pin
Functions
Ref.
5
9
6
1
