CTI Products EXB-232 Asynchronous Serial System Extender - Manual (Page 18)

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3.3.2 EXB-Serial Controls
The front panel "OPTION A" switches as well as the rear panel “OPTION B”, “BAUDn” and
“MODEn” switches provide for EXB module static configuration. Section 2.2 of this manual
lists the function of each switch position. This section details how to set the switches for each
type of intended use. The switches are read by the internal EXB circuits at module power up or
after pressing the RESET pushbutton on the EXB module front panel.
OPTION A
OPTION A switch positions 1 through 8 are not used on the EXB-Serial Module and should be
left in the UP position.
OPTION B
OPTION B switch positions 1 through 4 control the RS-232 handshaking. They are normally in
the UP position. See sections 2.2.1 for more details.
MODE 1 and MODE 2
Switches MODE 1 and MODE 2 are present only on the EXB-Serial Module and must be set to
0. On previous versions of EXB-Serial modules, the MODE 1 switch is labeled simply MODE
and the MODE 2 switch is not present.
BAUD 1 & BAUD 2
The rear panel BAUD 1 and BAUD 2 switches control the baud rate of serial PORT 1 and serial
PORT 2, respectively. See section 2.2 for more details. Set them as required.
Although baud rates down to 1200 are shown, the lower baud rates may introduce unacceptable
delays in the overall system. It is recommended that you use the highest baud rate supported by
your connecting channel.
NOTE: Set the BAUD n switch to 0 if the respective port will not be used. This is important, as
the front panel ERR LED will flash continuously if a serial port BAUD switch is non-zero and no
RS-232 communication channel is connected.
Alternately, the appropriate switches of Option B could be set Down for an unused port.