User port, 3 user port – Comtech EF Data SNM-1000 User Manual
Page 39

SNM-1000 Node Control Modem
Revision 3
Installation
MN/SNM1000.IOM
2–7
2.3.3 User
Port
The User Port provides for serial communications with the modem to allow configuration
of setup parameters and user requests for traffic channel assignments. The interface is
provided on a 9-pin MINI-DIN female connector (DCE) located on the rear panel of the
SNM-1000. Refer to the following listing for User Port specifications.
Connector Type
9-pin MINI-DIN
Signal Type
EIA-232
Rate
19.2 kbit/s, 8 bits-no parity-1stop
Note: Refer to Appendix A for a description of the software communications parameters
and for detailed message format information.
Pinout and signal levels are described in Table 2-3.
Table 2-3. SNM-1000 User Port Pinout and Signals
Signal Function
Name
Pin #
I/O
Signal Level
Receiver Ready
RR
1
O
EIA-232
Receive Data
RD
2
O
EIA-232
Send Data
SD
3
I
EIA-232
Terminal
Ready TR 4 I EIA-232
Signal Ground
SG
5
Data Mode
DM
6
O
EIA-232
Request to Send
RS
7
I
EIA-232
Clear to Send
CS
8
O
EIA-232
Incoming Call
IC
9
O
EIA-232