Specifications

18 PCL-846/847 User's Manual
Enable Mode Selection (JP4, JP6, JP8,
JP10)
Jumpers JP4, JP6, JP8 and JP10 set the driver enable mode selections
of ports 1, 2, 3, and 4 respectively. If a jumper is set to "AUTO," the
driver automatically senses the direction of the data flow and switches
the direction of transmission. No handshaking is necessary.
If a jumper is set to "RTS" (request to send), a high RTS signal will
enable the driver. Otherwise, the driver output will remain in high
impedance status.
If a jumper is set to "ON," the driver is always enabled, and always in
high or low status. The user must select a mode before beginning RS-
422 applications.