Maple Systems OIT Family - Manual (Page 102)

CHAPTER 11
Other OIT Operating Modes
Bypass Mode
(OIT3250, OIT4450, OIT5400 only)
The OIT3250, OIT4450 and OIT5400 have a bypass mode which allows most PLC
programming software to communicate through the OIT to the PLC. This allows you to
program both the OIT and the PLC from the same computer without having to swap
cables. Bypass mode does not work with PLC programming software that uses hardware
handshaking or 3-wire RS-485 connections. The RTS and CTS lines on Port1 are also
the RXD and TXD lines for Port2. Therefore, you will not be able to use bypass mode if
the PLC port (Port 1) RTS and CTS lines are being used or are connected to the PLC.
NOTE:When the OIT operates in bypass mode, it cannot communicate with the PLC.
To use bypass mode:
1. Connect the PC to Port 2 of the OIT.
2. Connect the PLC to Port 1 of the OIT.
3. If the OIT is already powered, press the OIT’s SETUP key. Otherwise, while
applying power to the OIT, press and hold the OIT’s SETUP key while the
“<<< Initializing >>>” message appears.
The “Enter Setup Password:” message should appear.
4. Type the setup password and then press the OIT’s ENTER key. If there is no setup
password, just press the OIT’s ENTER key.
NOTE:You must start entering your password within 5 seconds, or the OIT exits setup mode.
The “Download/Upload computer? YES” message should appear.
5. Press the OIT’s TOGGLE key to toggle the YES to NO. Then press the OIT’s ENTER
key.
The “Enter OIT Bypass Mode? NO” message should appear.
6. Press the OIT’s TOGGLE key to toggle the NO to YES. Then press the OIT’s ENTER
key.
The “*** Bypass Mode Active *** Press the [CLEAR] key to
reset OIT!” message should appear.
7. The OIT is now in bypass mode and the PC should be able to communicate with the
PLC.
8. When finished using bypass mode, press the OIT’s CLEAR key. The OIT
reinitializes.
Setup Mode
Setup mode allows the OIT to communicate with a PC using the OITware-200
configuration software. It also provides the ability to make the following changes to the
operation of the OIT without using OITware-200.
Other OIT Operating Modes 102
1010-0099, Rev. 07