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Gem6K Hardware Installation Guide
RS-232 Communications
Pin Out for RS-232 Communication:
Pin Description
2
Rx (receive). Connect to Tx on your computer.
3
Tx (transmit). Connect to Rx on your computer.
5
GND (logic ground). Connect to GND on your computer
•
Maximum RS-232 cable length is 50 feet (15.25 meters)
•
To establish unique addresses for daisy chained units, use the ADDR command.
Unit 0
Unit 1
Unit 2
Tx
Rx
GND
Daisy Chain to a Computer or Terminal
25-Pin COM Port:
9-Pin COM Port:
Serial Port Connection on PC
Pin 2 (Rx)
Pin 3 (Tx)
Pin 5 (GND)
Pin 2 (Tx)
Pin 3 (Rx)
Pin 7 (GND)
Rx
Tx
GND
Rx
Tx
GND
Rx
Tx
GND
Rx
Tx
GND
Rx
Tx
GND
RS-232 Daisy Chain Connections
RS-232 Daisy Chaining
Up to ninety-nine stand-alone Gem6K drives may be daisy chained. You can use
either the
RS-232/485
connector (COM1) or the
RS-232
connector (COM2) for
daisy chaining.
There are two methods of daisy chaining: one uses a computer or terminal as the
master controller in the chain; the other uses a Gem6K as the master controller.
Follow the steps below to implement daisy chaining with a terminal as the master.
(See the
Programmer’s Guide
for details on using a Gem6K as master controller.)
Step 1
Connect the daisy chain with a terminal as the master. (See the previous drawing.)
To enable and disable communications on a particular drive unit in the chain, you
must use the Daisy Chain Address (ADDR) command to establish a unique device
address for each unit. The ADDR command automatically configures unit ad-
dresses for daisy chaining. This command allows up to 99 units on a daisy chain
to be uniquely addressed, starting with Address 1.
Sending ADDRi to the first unit in the daisy chain sets its address to be (i). The
first unit in turn transmits ADDR(i + 1) to the next unit to set its address to (i + 1).
This continues down the daisy chain until the last unit of (n) daisy chained units
has its address set to (i + n).
Note that only a drive with the device address of zero (0) will send an initial
power-up start message. (ADDR0 is not normally used in a daisy chain.)
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