MFC-CB™ Operation and Maintenance Manual
©2001~2007
DH Instruments, a Fluke Company
Page 52
4.2.1
RS232 INTERFACE
To establish RS232 communications, a standard pin to pin DB-9F to DB-9M RS232 cable
must be used to connect the host COM port to MFC-CB COM1. The interface settings of
both ports must be the same.
MFC-CB supports an independent RS232 self-test to verify that the MFC-CB RS232 ports
are operating correctly and the interface cable being used is valid. Use this self-test to
troubleshoot if you are having difficulty establishing communications with MFC-CB COM1
(see Section 3.4.5.3).
4.2.1.1
COM1
The MFC-CB COM1 RS232 interface is located on the rear panel. It is a 9-pin
female DB connector configured as a DCE device. Data is transmitted out of
MFC-CB using pin 2, and is received on pin 3. This allows a standard pin to pin
DB-9M to DB-9F RS232 cable to be used to connect to a DTE host. Handshaking is
NOT required or supported.
COM1 RS232 commands must be terminated with at least a single carriage return
character, while line feed characters are ignored. All RS232 responses from the
MFC-CB are terminated with a carriage return character and a line feed character.
Table 6.
COM1 DB-9F Pin Designation
PIN #
FUNCTION
DESCRIPTION
2
TxD
This pin transmits serial data from the MFC-CB to the host.
3
RxD
This pin accepts serial data from the host computer.
5
Grn
This pin is the common return for the TxD and RxD signals.
IBM PC/XT DB-9F CONNECTIONS
IBM PC/XT DB-9M TO MFC-CB DB9F
CONNECTION
DB-25M
DB-9F
DB-9M
DB-9F
2 3 3
3
3 2 2
2
7 5 5
5
