User port operation, Chapter 4. user port operation, 1 user port operation – Comtech EF Data SNM-1010L User Manual
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Chapter 4. USER PORT
OPERATION
4.1
User Port Operation
The User Port allows the user at the remote site to communicate with the remote control
SNM-1010L to request the setup and termination of circuits, send and receive service
messages, and configure the SNM-1010L. The remote control SNM-1010L modem
always has an address of zero (0).
The User Port uses a 9-pin mini-DIN female connector on the rear of the SNM-1010L.
The port is configured as a DCE with the pin definitions as shown in the following
listing.
Signal Function
Name
Pin #
I/O
Signal Level
Receiver Ready
RR
1
O
EIA-232-C
Receive Data
RD
2
O
EIA-232-C
Send Data
SD
3
I
EIA-232-C
Terminal Ready
TR
4
I
EIA-232-C
Signal Ground
SG
5
Data Mode
DM
6
O
EIA-232-C
Request to Send
RS
7
I
EIA-232-C
Clear to Send
CS
8
O
EIA-232-C
Incoming Call
IC
9
O
EIA-232-C
The interface operates at 19.2 kbps, 8 data bits, no parity 1 stop bit,. Levels are in
accordance with EIA-232. The User Port can also be accessed using an optional Public
Switched Telephone Network (PSTN) dial-up modem.
4–1