Measurement Computing Serial488/4 - Manual (Page 24)

Section 1 Introduction
2.12
To reconfigure a serial port for RS-422 operation, remove the twelve
position configuration jumper and reinsert it so that the center socket is
now connected to the left socket as viewed from the rear of the unit. If
single ended operation is desired move the tw o flea clips to the position
farthest from the serial port connectors.
Once the jumper(s) have been repositioned for your particular
application, make note of the new jumper settings for later reference and
carefully reassemble the unit.
Figure 2-7. View of Configuration Jumpers - Factory Setting
All Ports configured as RS-232
RS422 RS232 RS422 RS232 RS422 RS232 RS422 RS232
JP109 JP110 JP104 JP105 JP114 JP115 JP119 JP120