Serial Printer Under RedHat 7.3

[Adam Ellis <AdamE AccelGrp com>]

I am trying to set up a serial printer (Okidata Microline 182 Plus) under
RedHat 7.3 and am not having much luck...maybe somebody out there has a few
tips for me.  The printer is plugged into the first DB9 serial port on my
computer (labeled 1).  The serial ports are found at boot:

<snip>
Serial driver version 5.05c (2001-07-08) with MANY_PORTS MULTIPORT SHARE_IRQ
SERIAL_PCI ISAPNP enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
</snip>

...and I am seeing this in /proc/tty/driver/serial:

<snip>
serinfo:1.0 driver:5.05c revision:2001-07-08
0: uart:16550A port:3F8 irq:4 baud:1200 tx:11 rx:0 RTS|DTR|DSR|RI
1: uart:16550A port:2F8 irq:3 baud:9600 tx:18 rx:0 
</snip>

However, the following command just hangs when I type it at the console:
# echo "hello" > /dev/ttyS0

And typing this just returns me to the command prompt with no result:
# echo "hello" > /dev/ttyS00

Does anybody have any idea what my problem is here?  Do I need to do
something with the setserial command?  Thanks in advance for your help.

AE