6
OEM6250 Installation Guide
Serial Communication
RS-232C Connections
LIMITS
RP240
9
5
1
9
1
49
50
Rx
Tx
GND
SHLD
1
Tx
Rx
GND
NOTE: Max. cable length is 50 ft (15.25 m)
AUX
1
7
1
9
25-Pin COM Port:
9-Pin COM Port:
Serial Port Connection
Pin 2 (Rx)
Pin 3 (Tx)
Pin 5 (GND)
Pin 2 (Tx)
Pin 3 (Rx)
Pin 7 (GND)
Rx
Tx
GND
Rx
Tx
GND
RS-232C Daisy-Chain Connections *
Rx
Tx
GND
SHLD
Rx
Tx
GND
SHLD
Unit 0
Unit 1
Unit 2
Tx
Rx
GND
Daisy Chain to a Computer or Terminal
Stand-Alone Daisy Chain
Be sure to set unique devices addresses for each unit.
To set the address, use the DIP switch (see below),
or use the
ADDR
command (see
6000 Series Software Reference).
*
Rx
Tx
GND
SHLD
Rx
Tx
GND
SHLD
Rx
Tx
GND
SHLD
Unit 0
Unit 1
Unit 2
Rx
Tx
GND
SHLD
Changing the address and baud rate (OPTIONAL)
Factory Settings
May Be Sufficient
• Device address is
set to zero (if you
are connecting
multiple units in a
daisy-chain, you
can automatically
establish the device
address by using
the
ADDR
command).
• Factory default
baud rate is 9600.
N
O
1234
DIP Switch
Factory Default Setting Shown
OEM6250
Switch #1
Switch #2
Switch #3
Device Address
To implement the Auto Baud feature:
Switch #4 ON = Auto Baud Enabled
Switch #4 OFF = Auto Baud Disabled (default)
The default baud rate is 9600. As an alternative, you can use
this procedure to automatically match your terminal's speed
of 1200, 2400, 4800, or 9600 baud.
1. Set switch 4 to ON.
2. Connect the OEM6250 to the terminal.
3. Power up the terminal.
4. Cycle power to the OEM6250 and immediately press the
space bar several times.
5. The OEM6250 should send a message with the baud rate
on the first line of the response. If no baud rate message
is displayed, verify steps 1-3 and repeat step 4.
6. Change switch 4 to OFF.
7. Cycle power to the OEM6250. This stores the baud rate
in non-volatile memory.
NOTE: If Auto Baud is enabled, the OEM6250 performs its
auto baud routine every time it is powered up or reset. The
OEM6250 is only capable of matching 1200, 2400, 4800, and
9600 baud. Once the baud rate has been determined, the
OEM6250 stores that baud rate in non-volatile memory;
therefore, Switch #4 should be set to the OFF position after
the baud rate has been determined.
ADDRESS
AUTO BAUD
OFF
OFF
OFF
Ø
(default)
ON
OFF
OFF
1
OFF
ON
OFF
2
ON
ON
OFF
3
OFF
OFF
ON
4
ON
OFF
ON
5
OFF
ON
ON
6
ON
ON
ON
7
* Device address is checked upon power up or reset.
