Unitek Peco 3-131-XX, User Manual

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Page 36 WELD SENTRY 2
COMMUNICATIONS INTERFACE
RS232 communications interface is used to transmit weld monitor process data and line voltage conditions
to a user supplied serial data logging device, such as a serial printer or personal computer, at speeds up to
9,600 Baud. The Sentry uses DTR/Busy hardware handshaking and does
not require a null modem to
operate with most serial printers and IBM personal computers.
RS-232 - Baud Rate: 1200, 2400, 4800, or 9600; Half-Duplex; 10 Bit Message (1 Start bit, 8 ASCII Coded
Data bits, and 1 Stop bit); No Parity Checking.
The ASCII format for data which is transmitted on the RS-232 Port requires 18 to 32 characters per test. In
the Binary format this is reduced to: 5 bytes plus 2 bytes per data point.
The connector used for the RS-232 Port is a DB-25 (P/N 250-182). This connector mates with a 6 foot
Male-to-Male DB-25 Cable Assembly (P/N 205-093). There are Shunts on the Sentry's Control Board
which allow Pins 2 and 3 to be reversed and which allow the Busy Signal to be placed on Pin 4, 5, 6 or 20.
DB-25 Connector Pins
1 - Circuit Ground
2 - Receive - Input (to Sentry)
3 - Transmit - Output (from Sentry)
4 - Request To Send
5 - Clear To Send
6 - Data Set Ready
7 - Circuit Ground
20 - Data Terminal Ready - Busy (Data sent when high)
COMMUNICATIONS CONFIGURATION SHUNTS - There are 5 Shunt positions on the Sentry's Control
Board which are used to select options related to the Sentry's Communications Port. E1 uses two Shunts,
E2, E3, E4 and E5 use one Shunt. The definition of each Shunt is shown below: The correct position for
the Model PTR Kodak Printer or a user supplied IBM compatible PC are shown in bold.
SHUNT POSITION CONTROLS
E1 BOTH VERTICAL*
-or-
BOTH HORIZONTAL
Sentry Transmits on Pin 3, Receives on Pin 2
Sentry Transmits on Pin 2, Receives on Pin 3
E2 Shunt on DTR
-or-
Shunt on CTS
Sentry Receives “Busy” Signal on Pin 6 or Pin 20.
Sentry Receives “Busy” Signal on Pin 4 or Pin 5.
E3 Shunt on RS-232
-or-
Shunt on RS-422
Sentry connected to an RS-232 System
Sentry connected to an RS-422 System
E4
Shunt on OUT
-or-
Shunt on IN
RS-232 System or Sentry is not Last Transmit Device .
Sentry is the Last Transmit Device in an RS-422 System.
E5 Shunt on OUT
-or-
Shunt on IN
RS-232 System or Sentry is not Last Receive Device.
Sentry is the Last Receive Device in an RS-422 System