Publication 1747-RM001G-EN-P - November 2008
SLC Passthru Communications 14-3
processor communications during end-of-scan. In program mode, the
processor continuously services communications including passthru.
The Passthru Link IDs for channel 0 and channel 1 are configured on the
General tab of the Channel Configuration screen. The default Passthru Link
IDs are one for channel 0 and two for channel 1. Valid Link IDs are 1 to
65,534.
Devices on the channel 1 network can initiate remote packets through the
passthru processor by setting the destination link ID equal to the passthru
processor’s channel 0 link ID. If channel 0 is configured for DH-485, then
devices on the channel 0 DH-485 network can initiate remote packets through
the passthru processor by setting the destination link ID equal to the passthru
processor’s channel 1 link ID.
When channel 0 is configured for DF1 Full-duplex protocol, the DF1
destination address becomes the channel 1 destination address. When channel
0 is configured for DF1 Half-duplex Master or DF1 Radio Modem protocol,
the DF1 destination address is 128 plus the channel 1 destination address. This
allows addresses 0 to 127 to be used within the DF1 Half-duplex or Radio
Modem networks, and addresses 128 and above to be used for passthru. Valid
channel 1 destination addresses are 0 to 31 for the 5/03, 0 to 63 (or 0 to 77
octal) for the 5/04 and 1 through up to 126 for the 5/05 depending on how
many valid IP addresses are entered into the Passthru Routing Table. DF1
Full-duplex packets received with a destination address equal to the passthru
processor’s channel 1 network address or outside of the valid channel 1
address range are kept and executed by the passthru processor. DF1
Half-duplex Master and DF1 Radio Modem packets received with a
TIP
Channel-to-channel passthru only works for single
hop bridging. One end node must be connected to
the channel 0 network and the other end node must
be connected to the channel 1 network. The channel
1 passthru link ID must match the network link ID of
the end node connected on the channel 1 network.
If channel 0 is configured for DH-485, then channel
0 passthru link ID must match the network link ID of
the end node connected on the channel 0 DH-485
network.
IMPORTANT
SLC remote message instructions can only be
configured to bridge to remote networks configured
with link IDs in the range of 1 to 254.
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