Page 37 of 68
Proton Products InteliSENS DG1130 Diameter Gauge Instruction Manual (Issue 1a)
RS-232
C
OMMUNICATIONS
This RS-232 interface is fitted as standard. It operates independently of the other communications
interfaces and may be accessed at the same time as them.
If the RS-232 interface “Mode” is set to “Print”, then an “Epson TM-U220D” or compatible printer may
be connected to the port and configured to print fault and reel report tickets.
RS-232 interface
The RS-232 interface may be accessed through the “RS232/485” connector.
Connector type: DB9 female (socket)
Pin Designation Comment
PC DB9 serial
port pin
2
TXD1
2
3
RXD1
3
5
GND_R
Ground reference is not isolated from earth.
5
7
CTS1
Not used
8
RTS1
Not used
S
Shield
Ensure that the cable shield is connected to this via the plug
shield connection.
Shield
The above table also shows the configuration of a cable for connection to a personal computer (PC)
type DB9 serial port.
The maximum baud rate depends on the cable capacitance and length. For low-cost overall shielded
cable with total capacitance of shield to core-plus-core to core of 300pF per metre, the maximum
recommended baud rates are as follows:
Cable length range / m
Maximum Baud rate / s
0
3
115200
3
10
38400
10
20
19200
20
40
9600
40
80
4800
RS-232
S
INGLE
L
ETTER
P
ROTOCOL
(SLP)
The DG-k series diameter gauges support the legacy Single Letter Protocol (SLP) for communications
over the RS-232 interface.
The SLP RS-232 data format is:
Number of data bits
Parity
Number of stop bits
Flow control
Default baud rate
7
None
2
None
115200 bit / s
