
4230/4232/4235 Communications modules
8-17
RXD
- control and data signals passing from modem to Comms
module.
CTS/RTS
- flow control - disabled at both ends by linking back
signals.
DSR
- signal from modem to Comms module indicating that a
powered up modem is connected. This signal is monitored on power
up by the Comms module.
DCD
- signal from modem to Comms module indicating that a good
line has been established. This signal is monitored by the Comms
module to determine the loss of the carrier (line lost or other end
hung up). If the carrier is lost then the Comms module resets the
modem.
DTR
- signal from Comms module to modem indicating that a
Comms module is connected and powered up. This signal also
provides a hardware reset to the modem.
Setting up Comms modules
Set the address of the Comms module on the rotary switch. This is a
hex switch and so has sixteen positions from 0 to F. The first Comms
module in a Local Hardware System communicates directly with the
computer and must be set to F. All other Comms modules in the
Local Hardware System should be set either to unique addresses
from 0 to 9, or set to E if used to increase the length of a branch
beyond 1000m or for RS232/RS485 and baud rate conversion for a
leased-line modem or other serial device (see earlier diagrams). A
Comms module connected to a dial-up modem at a remote site must
be set to F (and the DIR/DIAL link on jumper JU2 must be set to
DIAL, see below).
Jumper JU2 selects the mode of communication upstream, RS485 or
RS232. The DIR/DIAL link selects whether the comms module is
connected to a dial-up modem at a remote site (DIAL). JU3 selects the
mode of communication downstream, RS485 or RS232. Set these
jumpers according to the connections you have made.
The group of jumpers labelled JU1 provides baud rate selection for
the upstream RS232 or RS485. The group of jumpers labelled JU4
provides baud rate selection for the downstream RS232 or RS485. On
branches containing Controllers the downstream baud rate must be
9600.
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