Serial Communication - Graco Lube Sentinel II Instructions Manual

Serial Communication

Remote communication (up to 100 feet) can be
achieved using an RS-232-type port.
Information can be read from, or written to the Sentinel II
by a personal computer (or other intelligent device). This
communication is a master/slave protocol with the Senti-
nel II as the slave and the PC as the master.
NOTE: With the exception of a sign-on message when
powered up, the slave will not send any data or informa-
tion unless requested by the master.
• Data is sent across the serial port as ASCII charac-
ters with leading zeros suppressed.
• A BYTE can be up to 3 characters.
• An INTERGER can be up to 5 characters.
• Each command and each response is terminated
with a carriage return (CR) (ASCII - Hexadecimal
0D or Decimal 13)
• If the data is not presented in the correct format, the
command is not executed. Note that a "read" should
be made after doing a "write" to verify the proper
action has taken place.
NOTE: Changes made through the serial link are active
but not permanent until the "save to E
is issued. If the WC command is not issued, turning the
power off and on restores the originally saved operating
parameters. See page 26 for recommended, user sup-
plied, communication port connectors.
Serial Communication Wiring
• The Serial Communications are wired through a
6-point header on 0.1 inch centers (F
• Only three pins (1 - 3) are used (See Table 1).
• The other end of this cable may be connected to a
personal computer.
✓ Pin 1 (nearest to the transformer) is the signal
ground.
✓ Pin 2 is an output that connects to received data
at PC.
✓ Pin 3 is an input that connects to transmit data
of the PC.
313903B
Table 1: Serial Pin Data
2
" command (WC)
. 9).
IG
F
Pin # Description
Signal Ground
1
Read Data
2
Send Data
3
SERIAL PORT PLUG
1 SIG COMMON
2 READ DATA (OUTPUT)
3 XMIT DATA (INPUT
4
5
6
2 RCV DATA (INPUT)
3 XMIT DATA (INPUT)
5 SIGNAL GROUND
. 9
IG
Installation
PC PC
DB-9F DB-25F
5 7
2 3
3 2
J1
1
SERIAL
6
TO PC SERIAL PORT
2 XMIT DATA (OUTPUT)
3 RCV DATA (INPUT)
7 SIGNAL GROUND
9