
Chapter 6 - Initializing the GP
6-20
GP-2400/2500/2600 Series User Manual
RI/VCC (COM2)
This setting designates if the Serial Interface's #9 pin is used for RI or for VCC.
VCC is only enabled in RUN mode, and if the mode is changed from RUN to
OFFLINE, this will change to RI. When an Expansion Serial protocol is not used,
this setting is fixed at RI.
There is a danger that the SIO circuit can be damaged if the VCC set-
ting is used and the Expansion Serial Interface's check tool is con-
nected. 7.2.2 Self-Diagnosis - Details
COMMUNICATION FORMAT
Select one of the following options for the communication format: RS-232C, RS-
422 (4 line), or RS-422 (2 line).
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