Terrestrial Interface Types; Eia-232 Specification - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Specifications
A.12

Terrestrial Interface Types

The following interface types are available with electrical properties indicated in the
following subsections:
A.12.1

EIA-232 Specification

Circuit Supported
Driver Amplitude (RXD, RXC,
ST, CTS, DM, DSR)
Receiver Amplitude (TXD,
TXC, RTS, LL, MC)
Impedance
Data Rate
Modem Configuration
25-pin Connector
34-pin Connector
37-pin Connector
50-pin Connector
50-pin Connector
(Optional)
TXD, TXC, ST, RXD, RXC, DSR, DCD, CTS, LL, RTS, MC
0 / Space / ON (True): 10V, ± 5V
1 / Mark / OFF (False): -10V, ± 5V
0 / Space / ON (True): Minimum +1V
1 / Mark / OFF (False): Maximum -1V
5000, ± 2000Ω < 2500 pF
9.6 to 120 kbps
TXD Send Data
RXD Receive Data
RTS Request to Send
CTS Clear to Send
DM Data Mode
DSR Receiver Ready
MC Master Clock
LL Local Loopback
ST Send Timing
RXC Receive Timing
TXC Terminal Timing
MF Mod Fault (TTL)
DF Demod Fault (TTL)
EIA-422/
EIA-449
X
X
X
X
A–28
MN/SNM1001L.IOM
V.35
X
X
X
X
Revision 1