User`s manual

CHAPTER 5
RS-232C/422/485 INTERFACING
5-4
Additional RS-232 Software Commands
AUTOLF (on/off) Enables an auto line after each
transmitted carriage return.
Factory default value is ON.
BKONDEL (on/off) The backspace, space, backspace,
delete is echoed to the terminal
when the DELETE character is
entered. Factory default is ON.
DATA_GEN (on/off) Enables the Data General
protocol. Factory default is OFF.
ECHO (on/off) Characters received from the
ESTeem input device are echoed to
the input device. Factory default is
ON.
NUCR (on/off) ESTeem will send nulls to the
terminal after a carriage return
<CR>. Factory default is OFF.
NULF (on/off) ESTeem will send nulls after a line
feed <LF>. Factory default is OFF.
NULLS (0-255) Defines the number of nulls sent
after a carriage return <CR> or
line feed <LF>. Factory default is
0.
PROTOCOL (on/off) Enables the ENQ/ACK type of
protocol. The ENQ/ACK
characters are defined using
PROTORX and PROTOTX
commands. Factory default is
OFF.
PROTORX (0-255) Defines the inquiry character
received by the ESTeem. This
character when received is used to
signal the ESTeem to transmit the
PROTOTX character. Factory
default is 5.
PROTOTX (0-255) Defines the ACK character
transmitted by the ESTeem when
the PROTORX character is
received. Factory default is 6.
RS-422/485 CONFIGURATION
The ESTeem will support the requirements of the EIA
Standard RS-422/485. This is a four (4) wire interface
consisting of the TRANSMIT DATA (-), TRANSMIT
DATA (+), RECEIVE DATA (-), AND RECEIVE
DATA (+). These signals are available at the 25 pin
RS-232C connector on the modem.
Pin Description
9 BTR (-) TRANSMIT DATA (-)
10 BTR (+) TRANSMIT DATA (+)
DCE 14 BRX (+) RECEIVE DATA (+)
16 BRX (-) RECEIVE DATA (-)
This interface is designed to provide unipolar differential
drive to twisted pair or parallel wire transmission lines.
Note: The ESTeem can be factory configured for 2-
wire RS-485 interfacing. Call EST Customer
Support on 509-735-9092.