Specifications

MFC-CB™ Operation and Maintenance Manual

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