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

Page 39

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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