Pentair HAFFMANS RPU-352, Instruction Manual, Page: 72 / 112

HAFFMANS RPU 352, RPU 353, RPC 80 RPC 50
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Page 72 of 112 RPU 352, RPU 353, RPC 80, RPC 50
23.10 EXTERNAL LINK SET-UP
The External Link menu allows you to set the serial format for communications on the link.
These must be set up to match the serial format of the external computer connected to the
external link.
Baud Rate
( 300 to 19200 )
Number of Data Bits ( 7 or 8 )
Number of Stop Bits ( 1 or 2 )
Parity
( None, Odd or Even )
Handshake ( Hard or Soft )
The External Link socket is a female 25 way "D" connector arranged in the RS-232 Data
Terminal Equipment (DTE) format, see table 8.2.
Table 7.2
Pin Signal Name In/Out Notes
1 Chassis ground
2 Transmit Data (TXD) Out
3 Receive Data (RXD) In
4 Request to Send (RTS) Out hard handshake
5 Clear to Send (CTS) In hard handshake
7 Signal ground
14 (test signal) Out fixed "Off" (-9 volts)
20 Terminal Ready (DTR) Out fixed "On" (+9 volts)
Hard Handshake
In the Hard Handshake system the handshaking is managed by two extra signal connections.
The signals are described below from the point of view of the RPC-80. During Hard Handshake
the characters used for Soft Handshake control should not be used. If they are received by the
RPC-80 they will be treated as normal data characters which may produce errors.
1. Clear to Send (CTS) is an input to the RPC-80 that controls the transmitter in the RPC-
80. The signal comes from the RTS or DTR Output of the external computer. When CTS
is On the RPC-80 will transmit its data, when CTS is Off the RPC-80 will wait and not
transmit.
2. Request to Send (RTS) is an Output from the RPC-80 that must control the
transmitter in the external Computer. The signal usually goes to the CTS input of the
external computer. When RTS is On the RPC-80 is ready and able to receive data and
the external computer can transmit, when RTS is Off the external computer must wait
and not transmit.