Epson Multi-mode Data Controller MFJ-1278B Benutzerhandbuch

The Receive Data pin is an output line from the MFJ-1278B on which the attached 
device receives data.  The attached device is generally a computer or data terminal. 

 

The Request To Send pin is an input line to the MFJ-1278B on which the attached 
device requests clearance to transmit data to the MFJ-1278B. 

 

The Clear To Send pin is an  output from the MFJ-1278B signaling the attached 
device to send or refrain from sending data to the MFJ-1278B. This line is used for 
systems that require hardware flow control. 

 

The Data Set Ready pin is an output from the MFJ-1278B telling the attached device 
that the MFJ-1278B is operational. 

 

The Signal Ground pin is the common or return path for all signals between the 
MFJ-1278B and the attached device. 

 

The Data Carrier Detect pin is an  output from the MFJ-1278B.  As normally 
configured, DCD reflects the status of the CON LED:  It is true when an AX.25 
connection exists between your MFJ-1278B and another station; it is false when no 
connection exists. This configuration is useful when the MFJ-1278B is used with a 
telephone style Bulletin Board system.  Since the AX.25 protocol connection, 
analogous to a modem signal on the telephone, indicates the presence of a user.  
Shorting pins 1 and 2 of JMP1 on the MFJ-1278B mother board will cause this 
output to always be true. 

The MFJ-1278B performs an AUTOBAUD routine upon each power on cycle of the MFJ-
1278B.  The  AUTOBAUD command is user selectable.  The  AUTOBAUD command is 
defaulted to ON.  When AUTOBAUD is ON, MFJ-1278B will attempt to synchronize itself