Chapter 9. Eia-232 Data Interface - Asynchronous Operation; Introduction; Async Eia-232 Specifications - Comtech EF Data CDM-550T Manual

EIA-232 DATA INTERFACE -
ASYNCHRONOUS OPERATION
9.1

Introduction

The CDM-550T supports asynchronous RS232 in addition to synchronous RS232
formats. This is useful, for example, in connecting two computers together, via their
serial ports, at opposite ends of a satellite link. There are, however, some restrictions and
limitations when using this mode, and the user may have to experiment a little in order to
get reliable communication.
9.2

ASYNC EIA-232 Specifications

Maximum operating baud rate:
Additional data overhead required:
Maximum allowable baud rate
tolerance:
Character formats supported:
Flow control:
Handshaking line supported:
Connectivity required:
Rev. 1.3
9
Chapter 9.
57.6 kbaud (QPSK and OQPSK)
28.8 kbaud (BPSK)
Zero. A 9.6 kbaud connection uses a 9.6
kbps carrier.
+/- 600 ppm
Any, except those using 1.5 stop bits (see
note below)
None
Data Carrier Detect (DCD)
Rx data, Tx Data and Ground (DCD
optional)
9–1